PNAmble Posted June 15 Share Posted June 15 searched but couldn’t find an answer to this Got our final air test next week and just wondering what the best strategy is re MVHR. For Earlier Test (0.42) it wasn’t installed so we just taped up the penetrations. For this test can we just seal the outside ducts with an airtight membrane and tape? Link to comment Share on other sites More sharing options...
Russdl Posted June 15 Share Posted June 15 Can you not disconnect it inside the house and then cover the inlet and exhaust pipes with a plastic bag and a bit of tape? Link to comment Share on other sites More sharing options...
Andehh Posted June 15 Share Posted June 15 That's all we did, plastic bag and duct tape! 1 Link to comment Share on other sites More sharing options...
JohnMo Posted June 15 Share Posted June 15 We had an air test done pre plasterboard, fixed all leaks, then on the final air test the guy just put tape on the room terminals, test was no better than the first test. So don't do that. Do as others have said and isolate the mvhr from the outside world. Link to comment Share on other sites More sharing options...
Bonner Posted June 15 Share Posted June 15 +1 I just taped up the inlet and outlet terminals outside Link to comment Share on other sites More sharing options...
joe90 Posted June 15 Share Posted June 15 1 hour ago, Russdl said: Can you not disconnect it inside the house and then cover the inlet and exhaust pipes with a plastic bag and a bit of tape? That’s what I did. Link to comment Share on other sites More sharing options...
Dave Jones Posted June 18 Share Posted June 18 On 15/06/2024 at 08:22, JohnMo said: We had an air test done pre plasterboard, fixed all leaks, then on the final air test the guy just put tape on the room terminals, test was no better than the first test. So don't do that. Do as others have said and isolate the mvhr from the outside world. no ceilings ? Link to comment Share on other sites More sharing options...
JohnMo Posted June 18 Share Posted June 18 13 minutes ago, Dave Jones said: no ceilings ? Sorry you may need to expand, not sure what you are asking? Link to comment Share on other sites More sharing options...
Dave Jones Posted June 18 Share Posted June 18 2 minutes ago, JohnMo said: Sorry you may need to expand, not sure what you are asking? that big gap under the roof trusses Link to comment Share on other sites More sharing options...
JohnMo Posted June 18 Share Posted June 18 All rooms are vaulted. Vapour and airtightness layer then 50mm service void and plasterboard, taped. Link to comment Share on other sites More sharing options...
Dave Jones Posted June 18 Share Posted June 18 you said air test pre-plasterboard ? Would be hard with ceilings open to trusses no ? Link to comment Share on other sites More sharing options...
JohnMo Posted June 18 Share Posted June 18 43 minutes ago, Dave Jones said: you said air test pre-plasterboard ? Would be hard with ceilings open to trusses no ? It was just ready to plasterboard, all insulation, vapour and airtightness done, but with access to fix stuff. So service void battens on walls and ceilings etc. Holes through wall for mvhr were blanked off at the wall. Link to comment Share on other sites More sharing options...
PNAmble Posted June 19 Author Share Posted June 19 Thanks all. we also did a pre plasterboard (bare shell) 0.9, then a pre second fix test 0.42 We followed the advice re sealing the external MVHR ducts, it worked well enough, final result 0.47 ACPH. Electrician had to re feed wires through a duct during second fix due to a fault so looks like we didn’t seal it as well as we’d previously. 1 Link to comment Share on other sites More sharing options...
Meabh Posted August 16 Share Posted August 16 Hi all - we have powder coated external MVHR vents in rendered walls. Did anyone find a good way to tape up the vents without pulling all the paint off? We've already had a bit of paint come off (mastic man on a ladder!). Thanks Link to comment Share on other sites More sharing options...
JohnMo Posted August 16 Share Posted August 16 3 minutes ago, Meabh said: powder coated external MVHR vents If masking tape is pulling off the coating, they were badly done. I would strip the coating off and redo with a decent primer and top coat. It may be easiest to take the inlet and outlet off the MVHR unit and bag and tape the ends there. 1 Link to comment Share on other sites More sharing options...
MR10 Posted August 16 Share Posted August 16 Used boot covers over the outlets and taped over those. Link to comment Share on other sites More sharing options...
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