The Zest Iris Damper is an ideal air flow regulator and measuring device for circular ducts. Accurate control, smooth and quiet air flow and reliable measuring results are achieved by the special iris construction. An easily readable scale assists quick and simple adjustment with a standard 13mm spanner. In the fully open position the Zest Iris Damper provides 100% free area with no control mechanism in the airstream allowing easy and effective cleaning of the ductwork system.
The reducing orifice arrangement maintains a uniform airflow over the cross section of the duct. Closure of the iris produces an accurate throttling of air volume with an even air flow pattern, resulting in low noise levels.
The Iris Damper can be used for measuring air flow rates by means of the orifice plate principle. The accurate control mechanism guarantees exact opening dimensions corresponding to the adjustment scale. Each damper is provided with manometer connections for measuring the differential pressure which then can be directly used to determine the air flow from the measurement scale on the damper casing. The result of the regulation is thus immediately available and any subsequent checks can be carried out very quickly. Each damper is calibrated individually giving accurate measurement results, the method error being as low as +5% dependent on mounting position within the ventilation system (see mounting distances).
The Zest Iris Duct Damper has a ‘through the case’ air tightness which meets the requirements of the Eurovent Class C.
The Zest Iris Duct Damper is suitable for continuous use from -10ºC up to +80ºC (if there is moisture in the air the damper may freeze but will not be damaged in this condition unless operated whilst frozen).
For the best results the Zest Iris Damper should be installed in straight runs of ductwork. The damper may be fixed to ducting with rivets or self-tapping screws. We recommend joints are sealed with Tectape XT or Tecseal sealant to ensure an airtight connection. Flexible ducting may be fixed to the damper using Tecfix banding or clips.
The Zest Iris Damper is available in a comprehensive range of sizes from 80mm to 800mm.
The Zest Iris Damper is manufactured from hot dipped galvanised steel sheet and equipped with an adjustment scale and measuring connections. The tamper proof control knob is adjusted with the spanner provided (the 80mm dia. has a lockable lever). Spigots are fitted as standard with rubber gaskets.
|Made to order||No|
|Alternative Product Code||GALIRIS315|
|Round System (mm)||315|
|Diameter - Outer (mm)||314|
|Spigot size (mm)||314|
|Packaged Weight (Kg)||3.5|
|Temp Max (°C)||80|
|Temp Min (°C)||-10|
|Economy Delivery||Not Eligible|
|Manufacturer Product Code||231644|
Last Orders for delivery before Christmas
Please call us on 020 8463 9696 or place orders online by midday Thursday 20th December 2018.
Will be limited only to online queries, please allow up to 48 hours for a response.
All orders are subject to availability. Please call us on 020 8463 9696 to check availability or likely despatch date.
View full delivery dates here
SIDCUP SHOWROOM STORE (Get Directions)
Closes: 4:30pm Thirsday 20th December.
Opens: 8:00am Wednesday 2nd January 2019
|Shipping Method||Under £100*||Over £100*|
4 to 7 Days (Orders under £25 inc VAT)
4 to 7 Days (Orders over £25 inc VAT)
2 to 4 Days (Interlink or TNT)
Next Working Day Delivery+
* Usually £200+vat
+ Order before noon for Next Working Day Delivery for items in stock
Excludes Highlands, Islands, and Certain Postcodes.
Please Note: Ducting tubes over 200mm in diameter and 3 metres in length may incur additional shipping charges.
See the full delivery information here: Full delivery information
Your question will be sent to a member of our team. We'll email you the answer and post it on this page. If your question is about an order you already placed, please use our Contact Form to reach the customer service team.
|Ducting System||Actual dimensions (mm)||Space requirements (mm)||Airflow mm²|
For 4" (100mm) extractor fans or for low power cooker hoods up to 250m³/hour
|System 100 - Round||100||106||7,854|
|System 100 - Rectangular||110 x 54||116 x 60||5,940|
For medium extraction rates or if available depth is limited up to 500m³/hour
|System 125 - Round||125||131||12,272|
|System 125 - Rectangular||150 x 70||156 x 76||10,500|
For 6" (150mm) extractor fans or for high power cooker hoods up to 500m³/hour & above
|Megaduct 220 - Rectangular||220 x 90||227 x 97||17,968|
|System 204 - Rectangular||204 x 60||210 x 66||12,240|
|System 150 - Round||150||156||17,671|
|System 150 - Rectangular||180 x 90||186 x 96||16,200|
For a shallow space, such as ceiling voids or under floor, where high extraction rates are not needed:
|System 300 - Rectangular||308 x 29||314 x 35||8,932|
|System 225 - Rectangular||234 x 29||240 x 35||6,786|
| System 100 |
| System 125|
| System 150|
|System 204||System 225|
|System 220||System 300|
|Actual Dimensions (mm) Space Requirements (mm)|