Heat Recovery Unit Condensation Trap

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Plasic Condensation Trap
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Plasic Condensation Trap

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From: 5.83 (Incl. VAT @ 20%)

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100mm 4" Dia 5.83
125mm 5" Dia 8.34
150mm 6" Dia 10.53

Our Heat Recovery Ventilation Unit Duct Condensation Trap is designed to be fitted in-line to any heat recovery system to help reduce or eliminate condensation in bathrooms, shower rooms, kitchens, and utility rooms or anywhere that has high levels of condensation may build up.

  • Plastic ducting condensation traps are manufactured from flame retardant polymer.
  • Supplied with a 20mm overflow flow drain.
  • Available in 100mm, 125mm, 150mm Diameters.


Condensation traps are not designed to fit to flexible ventilation ducting. Please use in conjunction with solid PVC ducting. Condensation traps are only suitable in vertical ducting and cannot be used horizontally.
Please also note that the 100mm condensation traps are designed for 100mm and 110mm ducting and as such are a looser fit on 100mm pipe, this is the industry standard.

It is imperative to have some sort of condensation drain or trap in your heat recovery system. Generally, heat recovery units have condensation drains built-in as a heat recovery cubes have hot and cold airflows meeting inside.

Additionally, ducted heat recovery ventilation systems will generate condensation will occur when hot, humid air extracted from your bathroom, shower, kitchen or utility room and it hits the cooler surface of your ventilation duct. If the extracted air is sufficiently cooled, the moisture will be condensed back to water and will trap in your ducting.

As a rule of thumb, the more insulated your house is, the more condensation will be gererated by your heat recovery system.

Things to reduce or eliminate condensation being trapped in your duct.

  • Use a condensation trap with an overflow.
  • Use the shortest duct run to outside.
  • Use insulated ducting.

Use a condensation trap with an overflow.
By using a condensation trap, you can trap the water after it condenses and runs down your ventilation ducting. The overflow pipe will allow excess water to be safely drained away. Please ensure condensation traps are fitted at the lowest point in your ducting.

Use the shortest duct run to outside.
The shorter your duct run, the less chance your extract air has to cool down and condense.

Use insulated ducting

By using insulated ducting, the inner duct layer stays warmer, therefore keeps the extracted air at a higher temperature. The idea is for the water to condense outside the building and not in your ducting.

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