Garden mix room near Nottingham, UK
Posted: Tue, 2021-Jul-13, 16:37
Well what a mess I made of this job!
The new 150mm external fan I bought needed me to cut away at the plastic fascia board I had installed to make the front of the building look nice. I managed to do this with my jigsaw and got a pretty good clean cut.
I then had to widen the hole that connects to the silencer, so I cut a template with jigsaw and then used the router to follow this template to cut out the hole (couldn’t get jigsaw in the gap between the joists).
I finally then fitted the replacement fan and although it did move more air it was REALLY loud. Way too loud. Annoyingly to fit it I’d drilled some new holes in the backplate so I can’t even return it. It’s now on eBay…
After that disaster I re-read Jennifer’s thread to check what fan she’d bought, an in-line fan, and set about figuring out how to mount and conceal such a fan on the outside of my building.
I finally had a eureka moment when I realised that I could get a slightly smaller fan than Jennifer’s mounted between two of the protruding joists and this would connect at a right angle to the end of the silencer box. This would entail further bodging and a massive hole saw.
I got a 150mm in line fan with specs the same as Jennifer’s (similar size room) but slightly louder (34dB or something) and it arrived this morning.
I made a mess but got it done: I had to cut away at the underside of my overhanging roof, including cutting into and removing some of the insulation (!!).
The pictures explain this way better than words. I finally switched it on and it works and is much quieter. Now to finish / cover it all up again.
Morale of the story - do proper ventilation calculations that take into account back pressure. I also could have designed this in-line fan solution from the start but the idea never occurred.
The new 150mm external fan I bought needed me to cut away at the plastic fascia board I had installed to make the front of the building look nice. I managed to do this with my jigsaw and got a pretty good clean cut.
I then had to widen the hole that connects to the silencer, so I cut a template with jigsaw and then used the router to follow this template to cut out the hole (couldn’t get jigsaw in the gap between the joists).
I finally then fitted the replacement fan and although it did move more air it was REALLY loud. Way too loud. Annoyingly to fit it I’d drilled some new holes in the backplate so I can’t even return it. It’s now on eBay…
After that disaster I re-read Jennifer’s thread to check what fan she’d bought, an in-line fan, and set about figuring out how to mount and conceal such a fan on the outside of my building.
I finally had a eureka moment when I realised that I could get a slightly smaller fan than Jennifer’s mounted between two of the protruding joists and this would connect at a right angle to the end of the silencer box. This would entail further bodging and a massive hole saw.
I got a 150mm in line fan with specs the same as Jennifer’s (similar size room) but slightly louder (34dB or something) and it arrived this morning.
I made a mess but got it done: I had to cut away at the underside of my overhanging roof, including cutting into and removing some of the insulation (!!).
The pictures explain this way better than words. I finally switched it on and it works and is much quieter. Now to finish / cover it all up again.
Morale of the story - do proper ventilation calculations that take into account back pressure. I also could have designed this in-line fan solution from the start but the idea never occurred.