Help with appropriate roof vent / tile vent
Need some professional / experienced advice.
Currently building a pitched-roof extension to the side of the house which will contain a new kitchen. It will have a central island containing an 80cm hob, and with a ceiling extractor above it (all firm and finalised - don't want and too late for a hob-integrated - want 5 cooking rings - or separate downdraft extractor).
But the headache is venting the extractor fan out of the house.
- Needs to be 6" dia ducting to give the required flow rate (confirmed by a bunch of ceiling extractor fan suppliers)
- Probably can't go through the wall (see 1st photo) without creating a box-section under the ceiling for both extractor and ducting), which will affect the look of the room.
- ...so needs to either be recirculating (prefer not to, as ceiling is 3m up and recirculators aren't as effective), or through the roof.
- If it goes through the roof, it can't be through a simple low-flow / low-profile tile vent as the pressure from a >600m3/hr extractor fan will be far too much and if it doesn't damage the roof tile will lead to a ton of backpressure with notably lower performance/extra noise from the extractor.
- So the proposed solution is a large insulated mushroom-vent which is going to go in the second row of tiles down from the peak (see link / other images), which is (a) huge; and (b) black, unlike the rest of the roof.
So I feel backed into a corner right now - put up with an unsightly big black mushroom on the roof, or spoil the internal ceiling look (currently a nice, clean trapezoid - pitched front and back with a flat (3m high) central 50%+) with a dropped box-section for the extractor and ducting - that feels if anything sillier, as we're going to spend a lot more time looking at the inside of the room than the outside of the roof.
Any suggestions? Any alternatives? Anything I've not thought of?
Thanks,
Martin.
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