Please call our helpful sales team on 01799 528528 for up to date prices on the products below.


PosiMaster - for condensation control

PosiMaster-Roof for Houses & Bungalows
PosiMaster Roof

Order Code: POSIROOF

The PosiMaster-Roof unit is hung from a rafter in the loft and ducted via an air diffuser, normally mounted in the ceiling above the stairwell. All units are fitted with an energy efficient pre heater to temper incoming air. Once set up for the number of bedrooms, automatic sensors control the input speed as well as when the heater is needed. No actions are required by the user.

Key Features And Benefits

  • Simple to install & inexpensive to run
  • DC motor for quiet operation
  • Diffusers designed to minimise draughts
  • Air temperature cut out when incoming air temperature exceeds 25oC
  • Pre heat can be manually selected
  • Very Quiet
  • Electronic feedback to the motor ensures constant flow rate
  • Adjustable heater operational point between 8-20oC.
  • Electronic controller automatically monitors temperature of introduced air and activates pre heat to maintain comfort levels.
  • BRE Digest 390 compliant
  • Solid state electronics with high efficiency switching power supply
  • Blocked Filter Indication Light and Displays Filter Efficiency Via Display

Motor Supply Volume:

Bedrooms Air Flow Litres/Sec Wattage Cost/Year*
Based on 2017 Fuel Costs
Trickle Boost
1 13 25 3.6 £4.73
2 17 31 4.8 £6.31
3 21 38 5.5 £7.23
4 25 44 7.5 £9.86
5 29 50 11.5 £15.11
Manual speed Selection 10 - 60

*These prices are based on the units working 24/7, running 365 days a year. A typical winter when the Pre Heat is activated will cost approx. a further 8 pence per hour due to a 500 Watt heater. The heater can be turned off by the user, but the fan still runs maintaining a positive pressure.

Fan Dimensions

Unit Casing (mm) 500 x 370 x 180
Unit diffuser ceiling hole Dia. (mm) 200

Electrical Voltage

220/240V AC - 3 amp fuse required via a fused spur or plug in to mains

This unit comes with a 5 year guarantee

All prices include mainland UK delivery (exclusions apply )

Get Help or Advice!

The Condensation Shop offers a wide range of products to suit numerous condensation and damp related issues.

If you would like assistance in selecting the correct product for your specific problem please call our helpful Sales Team on 01799 528528, during normal opening hours.