We're completing a renovation of a 100 year old home (to the studs). We put in the new HVAC system including all new duck works (sheet metal ducts, looks like quality work, all done by the tradesmen themselves). The HVAC company is a very old, long standing company with a great reputation. But, they do not perform a pressure test on the system unless I push for it (and pay an extra $800).
For IAQ reasons, I want to make sure no air from the basement or garage (where the furnace is) makes its way into the house and that there is a slightly positive pressure in the house. We do have up to 20% outside air as part of the return/fresh air supply.
Any thoughts on the need for a pressure test on the system, how-to assure no air from the garage gets into the house and that a positive pressure is maintained in the home would be greatly appreciated.