I've looked at this back draft shutter again but I can't work out where to fit it on the ducting.
I have an inline fan in the loft. So I have ducting going from the inlet to the fan and then ducting from the fan to the outlet. I don't know whether it's best to put the shutter on the outlet ducting or the inlet? The airflow goes in the direction towards the outlet. I would have therefore thought its best to put shutter on outlet ducting but when I called manufacture to ask they reccomrnded inlet ducting
If it was anything like the shutter I had (and ended up not using), the only place you could really place it was on the input feed. The downward gradient from the fan meant that the shutter would never close if it was on the output.
My understanding is that the shutter should be on the output and the default position of the shutter when fan is not in use should be shutter closed. Then when the fan is in use the directional airflow forces the shutter open. The shutter will then close again once the fan is off.
However I just unsure due to the manufacture technical support chap stating it should be on the inlet ducting. I can't see how this would work though as the fan would be almost sucking the shutter open.
That's exactly how it would work in that situation; like you, I would have placed it on the output feed. Because mine didn't have a spring-mounted door, it couldn't work on the output unless it was slightly sloped upwards!
You can always remove the shutter later on; if you have a shuttered exit vent, you probably won't even need it.
It you hold the shutter unit at whatever angle it would be fitted on the exit pipe, and it stays closed (but opens when you blow on it on it in the right direction), it should be fine.
Ok. Thanks for your help. I just called technical support again and the chap this time confirm the shutter should go on the outlet quite close to the fan. Default position closed shutter and then open when fan is on.
I'll stick it in like this and see how it goes. Thanks for all your advice
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