Im instaling a cooker hood and want to vent through a double brick external wall, Ive seen an extractor kit that converts the round vent to a rectangular brick sized vent so the bricks can be removed instead of core drilling a hole. Question is - would the bricks in both skins will be aligned so you can remove the inner and outer brick and and push the square plastic venting sleeve through. If the bricks are offset surely this would not work??
Cooker hood vent
- Thread starter gavski34
- Start date
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The outer brick is removed to provide a neat finish in the external wall, then a corresponding hole needs to be made in the internal wall that aligns with it. Any minor internal damage subsequently caused by doing this can easily be repaired and redecorated, unlike the exterior wall.
Many houses have internal block walls, so removing the whole block would create a hole much larger than that required anyway.
A core drill is really the best solution it will make a neat circular hole through both walls, and provide a better outlet. A single brick sized outlet will add a restriction to the airflow.
Many houses have internal block walls, so removing the whole block would create a hole much larger than that required anyway.
A core drill is really the best solution it will make a neat circular hole through both walls, and provide a better outlet. A single brick sized outlet will add a restriction to the airflow.
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Then if you do go that route, the internal wall will have to be 'chopped out' accordingly to line up, which may involve removing parts of several bricks, and will require some making good internally. I agree with JohnD though, core drill is the way to go.
Core drill it is then - is there any disadvantage in stepping down the hole size eg from 150mm to 100mm, I am looking at an extraction rate of about 600m3/h, will 100mm be adequate?
modern kitchen extractors are usually 125mm, some are 150mm, so I'd make a hole big enough in case you change to a larger one in future. The 100mm size is pretty much obsolete now, except on some older or cheaper designs, and they will be less powerful, or more noisy, on a small duct. BTW I used to do 100mm and some modern "silent" fans, nominally 100mm, will not fit the duct. So I'd use 110mm now even for a WC fan.
If you hire the kit, you'll enjoy it so much that you'll want to make a hole for a bathroom and WC extractor, and you may as well make one for a tumble drier.
Be sure to get a drill with a clutch that will release if it jams. Being spun round on a powerful drill can easily break your wrist or throw you off the ladder with undesirable results.
If you hire the kit, you'll enjoy it so much that you'll want to make a hole for a bathroom and WC extractor, and you may as well make one for a tumble drier.
Be sure to get a drill with a clutch that will release if it jams. Being spun round on a powerful drill can easily break your wrist or throw you off the ladder with undesirable results.
Thanks, I have a decent sds drill with a clutch, so I,ll give it a go, I'll blame you if I end up with holes all over my house 
100mm outlet far from obsolete , last dozen kitchen extractor hood fans I checked out were all 100mm.
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"kitchen extractors"
Cooker hoods for example, or a non-hood fan that meets BRs.
100mm is popular in bathrooms and WCs, though.
Cooker hoods for example, or a non-hood fan that meets BRs.
100mm is popular in bathrooms and WCs, though.
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