Facebook Twitter Instagram YouTube Pinterest
  • NEWSLETTER
  • CONTACT US
  • FAQs
  • English
Facebook Twitter Pinterest linkedin Telegram
Fire Supplies
  • English
  • Login / Register
0
  • Your list is empty, add products to the list to send a request

  • English
0 items / AED 0.00
Menu
Fire Supplies Fire Supplies
  • English
0 items / AED 0.00
Browse Categories
  • DetectionDetection
    • SMOKE DETECTION
      • Smoke Detectors
      • Beam Detectors
      • Duct Detectors
      • Air Sampling Smoke Detectors
      • Explosion Proof
    • HEAT DETECTION
      • Heat Detectors
      • Linear Heat Detectors
      • Early Heat Detection
      • Explosion Proof
    • DETECTOR BASES
    • TESTING KITS
      • Smoke Detector Testers
      • Heat Detector Testers
      • Beam Detector Testers
      • Flame Detector Testers
    • GAS DETECTION
      • CO Detector
      • LPG Detector
      • O2 Detector
      • H2S Detector
      • Combustible Gas
      • Explosion Proof Gas
      • Single Gas Portable
      • Multi Gas Portable
      • Gas Detection Panels
    • ACCESSORIES
      • Detector Removal Tools
      • Tester Sprays & Oil Refills
      • Extension Poles
    • BY DETECTION TYPE
      • Flame Detectors
      • Conventional Detectors
      • Addressable Detectors
      • Standalone Detectors
      • Mains Powered Detectors
      • Intrinsically Safe Detectors
      • Wireless Detectors
      • Detectors during Construction
    BEST BRANDS
    • Testifire 1000-001 Smoke and Heat Detector Tester - Head Only AED 5,809.65 VAT included
    • Macurco EX-CH3CR-100L-R Propane (C3H8) 0-100%LEL Remote Sensor Explosion Proof Monitor AED 8,642.55 VAT included
    • Solo 760-001 Cordless Battery Baton
      Rated 5.00 out of 5
      AED 657.30 VAT included
    • FFE Fireray 3000 Beam Detector AED 2,887.50 VAT included
  • Emergency & Exit LightsEmergency & Exit Lights
    • EMERGENCY LIGHTS
      • Recessed Emergency Light
      • Surface Emergency Light
      • High Wattage Emergency Light
      • Weatherproof Emergency Light
      • Explosion Proof Emergency Light
      • Conversion Kits
    • EXIT LIGHTS
      • Recessed Exit Light
      • Surface Exit Light
      • Wall Exit Light
      • Weatherproof Exit Light
      • Explosion Proof Exit Light
    • FIRE RATED CABLES
      • Fire Rated Cables
    • CENTRAL BATTERY SYSTEM SPARES
      • Panel Cards
      • Addressable Lights
      • Addressable Modules
      • Fluorescent Tubes
    • SELF CONTAINED MONITORING SYSTEM SPARES
      • Panel Cards
      • Addressable Lights
    SUMMER OFFER
    • Denko CEL 13NM LED Compact Maintained Emergency Light
      Rated 5.00 out of 5
      AED 157.50 AED 110.25 VAT included
    • denko-emcel-12m-emergency-exit-light Denko EMCEL 12M Surface Mounted Emergency Exit Light AED 189.00 AED 157.50 VAT included
    • Denko CEL 11NM LED Compact Emergency Light AED 105.00 AED 73.50 VAT included
  • Fire ExtinguishersFire Extinguishers
    • FIRE EXTINGUISHERS
      • DCP Extinguishers
      • CO2 Extinguishers
      • Foam Extinguishers
      • Water Extinguishers
      • Wet Chemical Extinguishers
      • Clean Agent Extinguishers
      • Water Mist Extinguishers
      • Special Extinguishers
    • BY CONSTRUCTION
      • Cartridge Operated Extinguishers
      • Trolley Extinguishers
      • Marine Certified Extinguishers
      • Steel Finish Extinguisher
      • Automatic Ceiling Extinguisher
    • UL LISTED EXTINGUISHERS
    • STANDS & CABINETS
      • Extinguisher Stands
      • Extinguisher Cabinets
    • EXTINGUISHER REFILLING SERVICES
      • DCP Extinguisher Servicing
      • CO2 Extinguisher Servicing
      • Foam Extinguisher Servicing
      • Water Extinguisher Servicing
      • FM200 Cylinder Servicing
    • EXTINGUISHER REFILLING MACHINES
      • Refilling Machines
    BEST PRICING
    • single-door-fire-extinguisher-cabinet-800-x-500-x-250 Single Door Fire Extinguisher Cabinet - 800 x 500 x 250 AED 249.90 VAT included
    • lalizas-704422-dry-powder-2-kg-marine-approved-fire-extinguisher Lalizas 704422 Dry Powder 2 KG Marine Approved Fire Extinguisher AED 89.25 VAT included
    • 25 KG Dry Powder Fire Extinguisher Trolley Type
      Rated 5.00 out of 5
      AED 714.00 VAT included
  • Sprinklers & Fire FightingSprinklers & Fire Fighting
    • SPRINKLER HEADS
      • Upright Sprinklers
      • Pendent and Recessed Pendent Sprinklers
      • Concealed Pendent Sprinklers
      • Horizontal Sidewall Sprinklers
      • Vertical Sidewall Sprinklers
    • ALARM SWITCHES
      • Flow switch
      • Tamper Switch
      • Pressure Switch
    • FIRE BLANKETS
    • FIRE HOSE CABINETS
      • Single Door
      • Double Door
      • Breeching Inlet
    • FIRE HOSE REEL
      • Automatic
      • Manual
    • FIRE HOSE AND ACCESSORIES
    • BREECHING INLET
      • 6`` x 4way
      • 4`` x 2way
    • FIRE HYDRANT
      • Dry Type Pillar
    • LANDING VALVES
      • Angle Hose Valve
      • Flanged Inlet Valve
      • Threaded Inlet Valve
    • FIREFIGHTING VALVES
      • Non-Return Valve(NRV)
      • Gate Valve
      • Butterfly Valve
    • ALARM CHECK VALVE ASSEMBLY
    • ZONE CONTROL VALVE
    • OTHER VALVES
    • LEDE 4 Inch Resillient Seated Swing Check Valve, Flanged End, UL/FM Approved AED 2,079.00 VAT included
    • Firesupplies Sprinkler Cabinet For 12 Spare Head's AED 341.25 VAT included
    • fire-extinguisher-cabinet GRP Type Double Door Fire Hose Reel Cabinet AED 1,706.25 VAT included
    • cla-val-2050b-4kg1-angle-fire-protection-pressure-relief-valve Cla-Val 2050B-4KG1 Angle Fire Protection Pressure Relief Valve AED 6,759.90 VAT included
  • Safety GearSafety Gear
    • SAFETY GEAR
      • Eye Protection
      • Ear Protection
      • Face Protection
      • Head Protection
      • Respiratory Protection
      • Hand Protection
      • Foot Protection
      • Fall Protection
      • Body Protection
    • Evacuation Equipment
      • Disposable Coveralls
      • Flashlights
      • OTHER SAFETY EQUIP.
      • Others
      • Filters & Cartridges
      • Shower & Eyewashes
      • Air Purifying Respirators
      • Chemical & Liquid Protection
      • Marine Safety Gear
    Best Brands
    • Roughneck P2 -White
      Rated 4.00 out of 5
      AED 173.97 VAT included
    • Roughneck P2 -Yellow AED 173.97 VAT included
    • Canasafe iMPactoR I Twizloc Yellow Hat AED 33.21 VAT included
  • OthersOthers
    • Spare parts
      • Spare parts
      • Notification Devices
      • Panel Parts
      • Batteries for Fire Panels
      • Respiratory Protection
    • Explosion Proof Devices
      • Power Supply Units
      • Photoluminescent Sign
      • Air Purifying Respirators
    • Cables
      • Fire Rated Cables
      • Speakers & Speaker Flashers
      • Abort & Disable Switches
      • Fire Rated Doors
      • Manual Call Point
    • Home Automation
      • Smoke Ventilation and Controls
    • Control Panels
      • Conventional Panels
      • Addressable Panels
      • Release Panels
      • Gas Detection Panels
      • Repeater Panels
    • UPS Units & Accessories
    SPECIAL PRICES
    • Vesda VRT-900 Remote Relays (12 Relays) AED 3,705.45 VAT included
    • Fireclass 508.032.703 Precept EN 8 Zone AED 3,044.21 VAT included
    • Amaron Quanta 12AL042 (12V, 42AH) VRLA SMF Battery AED 239.40 VAT included
  • WirelessWireless
    • Wireless Solutions
      • Wireless Fire Alarm System
      • Wireless Smoke Alarms
      • Wireless Emergency Lighting
      • Wireless Gas Detection
    Wireless Solutions
    • Cygnus CYHF/MSDB Wireless Multi Sensor with Base and Batteries AED 1,308.83 VAT included
    • ROYAL_TV_1000 Elotec ROYAL TV 1000 Wireless Heat Detector AED 787.50 VAT included
    • Cygnus CYHF/EM Wireless Expander Module (Requires Power Supply) AED 1,691.45 VAT included
  • CD ApprovedCD Approved
      • Abu Dhabi CD Approved
      • Dubai CD Approved
      • Sharjah CD Approved
      • RAK CD Approved
      • Fujairah CD Approved
      • Ajman CD Approved
      • UAQ CD Approved
    • Mobiak MBK17-020CA-VR 2kg CO2 Fire Extinguisher AED 95.55 VAT included
    • Potter PAD100-HD Rate of Rise / Fixed Temperature Heat Sensor AED 441.00 VAT included
    • Denko EMEX 1602RM Self Contained Exit Light AED 262.50 VAT included
  • Inspection & Training
    • Training
      • First Aid & CPR Training
      • Emergency First Aid at Work
      • Fire Safety(Level-1) Training
      • Fire Safety(Level-2) Training

    Special Training

    • firefighting-emergency-cpr-training Firefighting Emergency First Aid & CPR Training AED 525.00 VAT included
    • habc-level-2-international-award-in-emergency-first-aid-at-work HABC Level 2 International Award in Emergency First Aid at Work AED 682.50 VAT included
    • civil-defence-approved-fire-safetylevel-1-training Civil Defence Approved Fire Safety(Level-1) Training AED 525.00 VAT included
    • dubai-civil-defence-approved-fire-safetylevel-2-training Dubai Civil Defence Approved Fire Safety(Level-2)/Fire Warden Training AED 682.50 VAT included
  • Brands

      • AGF
      • Applus Laboratories
      • Anaf
      • Ansell
      • Bartels+Reiger
      • Bullard
      • Bulldozer
      • BW Technologies
      • CanaSafe
      • Centurion
      • CTS
      • Doncaster Cable
      • Denko
      • Etche Securite
      • Elotec
      • Euro Safety
      • Fenzy
      • Fiber Metal
      • Firehawk
      • FireMaster
      • Fireview
      • Firex
      • First Aid Only
      • Flowage
      • Honeywell
      • HSI Fire
      • Inverno
      • Lalizas
      • Macurco
      • MAF Fire & Safety
      • Mamac System
      • Mastech
      • MegaSafety
      • Microgard
      • MTS
      • Nomadic
      • Notifier
      • Omex
      • Orientex
      • Polon-Alfa
      • Potter
      • Portwest
      • Promax
      • Pyrexx
      • Rocket
      • Salisbury
      • Sam com
      • Spasciani
      • Silber
      • Streamlight
      • Lakeland
      • WES
      • System Sensor
      • Tahadi

  • Home
  • About Us
  • Blog
  • Rentals & AMC
  • Training & Inspection
    • Emergency First Aid & CPR Training
    • HABC Level 2 International Award in Emergency First Aid at Work
    • Civil Defence Approved Fire Safety(Level-1) Training
    • Dubai Civil Defence Approved Fire Safety(Level-2) Training
  • Contact Us
HomeDetectorsSmoke DetectionSmoke Detectors Polon Alfa DUO – 6046 Smoke detector
Previous product
eml-414-emergency-exit-light-hanging
EML 515 Addressable Emergency Exit Lights For Indoor AED 305.55 VAT included
Back to products
Next product
eml-6014-emergency-exit-light
EML 6014 Emergency Exit Light For Sidewall AED 420.00 VAT included
Polon Alfa DUO - 6046 Smoke detector
Click to enlarge
Share
Facebook Twitter Pinterest linkedin Telegram

Polon Alfa DUO – 6046 Smoke detector

AED 630.00 VAT included

Polon Alfa DUO – 6046 Smoke detector, Addressable multi-sensor smoke, and heat detector DUO-6046 are designed for the detection of visible smoke or/and the rise of temperature at the very early stage of fire. The detector is resistant to air movement and air pressure changes. Using the doubled smoke sensor (IR and UV range) and doubled heat sensors guarantee high resistance to false alarms caused by water vapors or dust while maintaining small dimensions and high aesthetics of the detector.

Build Enquiry List
This product is already in quote request list
Browse the list
Compare
Seller: Approved by :
  • free delivery

    Above AED1000 in UAE

  • WARRANTY

    For 365 days

  • always authentic

    Only Reputed Brands

  • EASY PAYMENT

    Multiple payment options

Description

Polon Alfa DUO – 6046 Smoke detector, Addressable multi-sensor smoke, and heat detector DUO-6046 are designed for the detection of visible smoke or/and the rise of temperature at the very early stage of fire. The detector is resistant to air movement and air pressure changes. Using the doubled smoke sensor (IR and UV range) and doubled heat sensors guarantee high resistance to false alarms caused by water vapors or dust while maintaining small dimensions and high aesthetics of the detector. DUO-6046 detector is dedicated to operation on addressable detection loops of POLON 4000 and POLON 6000 systems fire alarm control panels.

Features

  • Addressable multi-sensor smoke and heat detector
  • Designed for the detection of visible smoke
  • Detector is resistant to air movement and air pressure changes.
  • Doubled heat sensors guarantee high resistance to false alarms caused by water vapors or dust
  • Dedicated to operation on addressable detection loops

Specifications

  • Product: Addressable Smoke Detector
  • Brand: Polon-Alfa
  • Model: DUO 6046
  • Operating voltage: from 16.5 & 24.6 V
  • Number of programmable modes of operation: 6
  • Operational temperature range: from -25 oC to +55 oC
  • Detector dimensions (with G-40 base):  115 x 54 mm
  • Weight: < 0,2 kg

X

Kindly fill in details to download pdf

This is a required field. This is a required field.
CAPTCHA
This is a required field
please wait...

Related products

Compare
Close

Simplex 4098-9714 Addressable Photoelectric Fire Smoke Sensor

AED 525.00 VAT included
Simplex 4098-9714 Addressable Photoelectric Fire Smoke Sensor is a replacement photoelectric plug-in smoke detector head for use with Simplex addressable fire alarm control panels using IDNet or MAPNET II two-wire communications.
Add to cart
Quick View
Compare
Close

GST C-9102 Conventional Smoke Detector with base

AED 105.00 VAT included
GST C-9102 Conventional Photoelectric Smoke Detector is non-addressable. Used together with end of line unit, it can connect with compatible control panels to process detection signals. It shows fire alarm by LED indicators and transmits the fire signal to the control panel. Using infrared scattering technology, the smoke density can be detected. The detector receives very weak infrared light under normal smokeless condition. If smoke particles enter the chamber, the received light signal will increase by scattering. When smoke density reaches a pre-set level, the detector will alarm out.
Add to cart
Quick View
Compare
Close

First Alert SA340 Smoke Alarm With Lithium Battery 10 Years

AED 233.10 VAT included
First Alert SA340 Smoke Alarm With Lithium Battery 10 Years is a great choice for rental properties or areas of a home with high ceilings that make battery replacements more difficult. This alarm is sold with an insertable tamperproof lithium power cell pack that will last for 10 years after installation; eliminating the hassle of battery replacements for the life of the alarm.
Add to cart
Quick View
Compare
Close

Fike Sita 205 0012 Multipoint Asd Detector With Sounder/Strobe

AED 497.70 VAT included
Fike Sita 205 0012 Multipoint Asd Detector With Sounder/Strobe Multi-function smoke and heat detector with three smoke detection modes and three heat detection modes. Inbuilt sounder/strobe with seven sound patterns and three volumes (75, 85 and 92dB)Inbuilt short circuit isolator
Add to cart
Quick View
honeywell-tc906a1010-smoke-detector
Compare
Close

Honeywell TC906A1010 Photoelectric Smoke Detector

AED 1,181.25 VAT included
Honeywell TC906A1010 Photoelectric Smoke Detectors have state-of-the-art sensing chambers that are engineered to sense smoke produced by a wide range of combustion sources. The sensing chambers employ features that minimize the effects of settled dust on their performance. The detectors are designed with tri-color LEDs to indicate detector status and can be programmed to either make the LEDs blink
Add to cart
Quick View
Compare
Close

FFE Fireray 3000 Beam Detector

AED 2,887.50 VAT included
Fireray 3000 End to End Infrared Optical Beam Smoke Detector (OBSD) has been designed using the latest optical technology, incorporating modern industrial, electronic and software techniques. This detector offers cost effective protection of large, open area spaces with high ceilings. It is also very suited to applications where access to ceiling mounted smoke detectors presents practical difficulties.
Add to cart
Quick View
Dubai Civil Defense approval
-19%
MAF-SMOKE-DETECTOR-DCD-APPROVED-UAE-1 (1)
Compare
Close

MAF – 360 – S2 Analog Addressable Photoelectric Smoke Detector

AED 107.10 AED 86.63 VAT included
MAF-360 – S 2 analog addressable photoelectric smoke detectors are microprocessor controlled state-of-the-art detectors suitable for connection to MAF addressable fire detection control and indicating equipment.
Select options
Quick View
Compare
Close

Codesec Addressable Smoke Detector

Rated 5.00 out of 5
AED 98.70 – AED 219.45 VAT included
Applus Laboratories Addressable Smoke Detectors with Base and with Sounder Base are available with Dual Indicator with lightway. By Intelligent
Select options
Quick View

Reviews

Be the first to review “Polon Alfa DUO – 6046 Smoke detector” Cancel reply

Your email address will not be published. Required fields are marked *

Reviews

There are no reviews yet.

  • Questions & Answers
  • Reviews (0)
Questions & Answers

Questions and answers of the customers

There are no questions yet. Be the first to ask a question about this product.

Send me a notification for each new answer.
Reviews (0)

Reviews

Be the first to review “Polon Alfa DUO – 6046 Smoke detector” Cancel reply

Your email address will not be published. Required fields are marked *

Reviews

There are no reviews yet.

Got Questions ? Call us now!
04-5145713

Contact Info

[email protected]
Working Hours

Saturday to Thursday 8:30am – 5:30pm
Find It Fast
  • Smoke Detectors
  • Detector Testers
  • Fire Extinguishers
  • Emergency & Exit Lights
  • Fire Rated Cables
  • Sprinklers & Fire Fighting
  • Spare Parts & Accessories
  • Deal Zone
Quick Links
  • About Us
  • Contact Us
  • Wishlist
  • Compare
  • FAQ
  • Civil Defense Certifications
  • Blog
  • Request a Quote
Customer Care
  • My Account
  • Track your Order
  • Terms Of Sale
  • Cancellations And Returns
  • UAE And International Shipping
  • Cookie Policy
  • Privacy Policy
  • Terms and Conditions
Copyright © 2020 - Fire Supplies. | All Rights Reserved
payments
I allow the Site owner to contact me via email/phone to discuss this enquiry.

Sending...

  • English
  • DetectionDetection
    • Smoke Detection
    • Smoke Detectors
    • Beam Detectors
    • Duct Detectors
    • Air Sampling Smoke Detectors
    • Explosion Proof
    • Heat Detection
    • Linear Heat Detector
    • Early Heat Detection
    • Explosion Proof
    • Gas Detection
    • CO Detector
    • LPG Detector
    • O2 Detector
    • Combustible Gas Detector
    • Explosion Proof Gas
    • Single Gas Portable
    • Multi Gas Portable
    • Gas Detection Panel
    • Detector Bases
    • By Detection Type
    • Flame Detectors
    • Conventional Detectors
    • Addressable Detectors
    • Standalone Detectors
    • Mains Powered Detectors
    • Intrinsically Safe Detectors
    • Wireless Detectors
    • Detectors during Construction
    • Testing Kits
    • Smoke Detector Testers
    • Heat Detector Testers
    • Beam Detector Testers
    • Flame Detector Testers
    • Tester Sprays & Oil refills
    • Detector Removal Tools
    • Extension poles
  • Emergency LightsEmergency Lights
    • Recessed Emergency Light
    • Surface Emergency Light
    • High Wattage Emergency Light
    • Weatherproof Emergency Light
    • Explosion proof Emergency Light
    • Exit Lights
    • Recessed Exit Light
    • Surface Exit Light
    • Wall Exit Light
    • Weatherproof Exit Light
    • Explosion proof Exit Light
    • Fire Rated Cables
    • Central Battery System Spares
    • Panel Cards
    • Addressable emergency and exit lights
    • Address Modules
    • Self Contained Monitored System Spares
    • Panel Cards
    • Addressable Lights
  • Fire ExtinguishersFire Extinguishers
    • Extinguisher TypesExtinguisher Types
    • DCP Extinguishers
    • CO2 Extinguishers
    • Foam Extinguishers
    • Water Extinguishers
    • Wet Chemical Extinguisher
    • Clean Agent Extinguishers
    • Water Mist Extinguisher
    • Special Extinguishers
    • By Construction
    • Cartridge Operated Extinguishers
    • Trolley Extinguishers
    • Marine Certified Extinguishers
    • Steel Finish Extinguisher
    • Automatic Ceiling Extinguishers
    • UL Listed Extinguisher
    • Stands & Cabinets
    • Extinguisher Stands
    • Extinguisher Cabinets
    • Extinguisher Refilling Services
    • DCP Extinguisher Servicing
    • CO2 Extinguisher Servicing
    • Foam Extinguisher Servicing
    • Water Extinguisher Servicing
    • FM200 Extinguisher Servicing
    • Extinguisher Refilling Machines
    • Refilling Machines
  • Sprinklers & Fire FightingSprinklers & Fire Fighting
    • Sprinkler Heads
    • Upright Sprinklers
    • Pendant Sprinklers and recessed Pendant Sprinklers
    • Concealed Pendent Sprinklers
    • Horizontal Sidewall Sprinklers
    • Vertical Sidewall Sprinklers
    • Alarm Switches
    • Flow switch
    • Supervisory Tamper Switch
    • Pressure Switch
    • Fire Blankets
    • Fire Hose Cabinets
    • Single Door
    • Breeching Inlet
    • Double Door
    • Fire Hose Reel
    • Automatic Fire Hose Reel
    • Manual Fire Hose Reel
    • Fire Hose Accessories
    • Breeching Inlet
    • Fire Hydrant
    • Dry Type Pillar
    • Landing Valves
    • Angle Hose Valve
    • Flanged Inlet
    • Threaded Inlet
    • Fire fighting Valves
    • Non Return Valve
    • Gate Valve
    • Butterfly Valve
    • Alarm Check Valve Assembly
    • Zone Control Valve
    • Other Valves
  • Safety GearSafety Gear
    • Safety GearSafety Gear
    • Eye Protection
    • Ear Protection
    • Face Protection
    • Head Protection
    • Respiratory Protection
    • Hand Protection Safety Gloves
    • Foot Protection
    • Body Protection
    • Fall Protection
    • Chemical & Liquid Protection
    • Electrical Safety Gear
    • Flashlights
    • Marine Safety Gear
    • Shower And Eyewashs
    • Disposable Coveralls
    • Evacuation Equipment
    • Other Protection
    • Filters & Cartridges
    • Air Purifying Respirators
  • OthersOthers
    • Spare Parts
    • Notification Devices
    • Panel Parts
    • Batteries for Fire Panels
    • Cables
    • Fire Rated Cables
    • Speakers & Speaker Flashers
    • Abort and Disable Switches
    • Fire Rated Doors
    • Manual Call Point
    • Explosion Proof Devices
    • Power Supply Units
    • Photoluminescent Sign
    • Home Automation
    • Smoke Ventilation and Controls
    • Control Panels
    • Conventional Panels
    • Addressable Panels
    • Release Panels
    • Gas Detection Panel
    • Repeater Panels
  • WirelessWireless
    • Wireless Solutions
    • Wireless Fire Alarm System
    • Wireless Smoke Alarms
    • Wireless Emergency Lighting
    • Wireless Gas Detection
  • CD ApprovedCD Approved
    • Abu Dhabi CD Approved
    • Dubai CD Approved
    • Sharjah CD Approved
    • Ajman CD Approved
    • UAQ CD Approved
    • RAK CD Approved
    • Fujairah CD Approved
  • Brands
  • Request a Quote
  • Rentals and AMC
  • Login / Register

Shopping cart

close

Sign in

close

Lost your password?
No account yet? Create an Account
Scroll To Top