andyscotland Posted August 8, 2019 Share Posted August 8, 2019 Possibly a daft / over-cautious question... I need to drill through our existing brick cavity wall to fit a duct for a relocated airbrick vent. From a structural perspective, does it make much odds if I make a circular (125 mm dia) or rectangular (210 X 65) opening? The outside wall is pebbledashed so I won't easily be able to find and remove a single brick, or line the hole up neatly with brick joints. I can probably get fairly close though by measuring along the wall from one of the existing airbricks. I will be stitch drilling and chiselling out so I think a rectangle would be easier to cut but I have a feeling a circle (arch) would support the wall above better. But perhaps it's such a small opening it doesn't make much difference? Link to comment Share on other sites More sharing options...
Russell griffiths Posted August 9, 2019 Share Posted August 9, 2019 Won’t have any effect, make it any shape you want. How will you fit a square airbrick in a round hole ?? Link to comment Share on other sites More sharing options...
andyscotland Posted August 9, 2019 Author Share Posted August 9, 2019 @Russell griffiths thanks - if a round hole I'd just have used a normal round duct terminal. As presumably doesn't need to be an actual airbrick so long as there's a big enough ventilation area. But I will go for rectangular to make it easier to chisel. Link to comment Share on other sites More sharing options...
nod Posted August 9, 2019 Share Posted August 9, 2019 Most hire company’s will hire you a core drill and bit for a two hour slot I think about £30 round here It would be a lot neater Quicker and save you a lot of work Also when you are chiselling it’s easy to knock half a brick into the cavity Link to comment Share on other sites More sharing options...
andyscotland Posted August 9, 2019 Author Share Posted August 9, 2019 @nod thanks - I'd thought of hiring a core then ruled it out as I also have to drill a (different) vent through blockwork 2.5m above the floor and don't fancy core drilling up a ladder. But of course actually there's no reason I have to make both holes the same way. I'll maybe get a core for the airbrick duct. Link to comment Share on other sites More sharing options...
nod Posted August 9, 2019 Share Posted August 9, 2019 As long as the drill has a slip clutch like all the hire ones Your perfectly safe on a platform I drilled all my 5 mtr high holes for fans off a tower Link to comment Share on other sites More sharing options...
andyscotland Posted August 9, 2019 Author Share Posted August 9, 2019 @nod a platform / tower I'd be ok with - have done that before. But don't have one at present and this is probably the only job I'd really need it for so not really worth it. Link to comment Share on other sites More sharing options...
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