Integrity-TestingAn Integrity test predicts how long fire suppressant agents take to descend to a given level in the room without having to release the gas itself. This is done by sealing the room and testing the air pressure in the room – with our door fan equipment.

First the room is pressurised, readings taken, then afterwards to check those measurements the room is depressurised to take measurements to compare. The predicted retention time is calculated from these leakage characteristics and the enclosure and extinguishing system data.

A retention time of 10 minutes is the normal minimum period the suppressant agents are required to be retained for. Ten minutes is long enough for most deep-seated fires to be cooled so that re-ignition is unlikely. All room integrity tests conform to the guidelines set out in BS5306 and NFPA2001. It is applicable to all sizes of enclosure and all extinguishing gases, including IG55, IG541, FM200, FE25, HFC

227ea, FE25, Novec 1230 and CO2. After initial installation, integrity tests should be carried out at least annually thereafter.


This blower door system comes with our ultra high performance 3300-series fan and our DM-2 digital manometer which interfaces with the system for automated blower door testing. It is a useful system for testing airtightness in residential and mid-sized commercial structures.

All Retrotec fans are made with extremely durable space-age hard plastic foam, which makes them both lightweight and tough. They are also easily reversible: to switch from pressurizing to depressurizing your enclosure, simply flip the fan around in its panel.

The DM-2 that comes with this system offers an onboard “Set-and-Forget” control of enclosure pressure and flow pressure. All you need to do is choose your desired pressure, and then let the DM-2 do the rest. As you

seal the leaks in your enclosure and the leakage rate decreases, the system automatically and instantly readjusts to the correct pressure.