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Hi Apoc, Yes, as we went along it became apparent they are different systems, but air pressure equalisation is still the problem. I agree that simply opening windows will solve it, I guess turning down the fan will help as well but INV is looking for alternatives to having windows open...

Hi, It would seem that yours is different to ours, but the concept of equal air pressure would still have an effect. As you have whirly birds on the roof, you could put vents/grills through the ceiling into the roof cavity. As we know hot air rises so this would allow the air pressure...

Me again :) Perhaps that security grill in the ceiling is actually a return air vent with a blocked filter. Have you cleaned all of the return air vent filters recently, could be worth a try. We both have two return air vents with filters that need to be cleaned at least every six...

I have ducted air con and I have an air return grill in each isolation switch area so that the air coming from the AC is the same as the amount of being returned to the AC. My brother also has Ducted AC and he has no problems with doors windows etc except that it is more efficient if all...