Manual-D is ACCA’s duct design method for properly sizing the airflow pathways – the ductwork – within a residential heating and cooling system. Even though
Manual-S is being required by many building programs and local codes these days. The problem is, it’s really hard to tell whether the installing contractor
Are you still using rules of thumb to size HVAC equipment? This one size fits all approach can get you in trouble with your clients
Our last Manual-J post focused on envelope loads and how important it is to properly account for them in your HVAC design. Now we will turn
The Building Performance Institute (BPI) announced a new course this summer for individuals who perform building infiltration and duct leakage testing. The BPI Infiltration and Duct Leakage
This week’s HERS Rater training course was in Manteo, NC, just across the water from the Outer Banks. We had a great group of folks
Not only do homeowners want an efficient house, but they also assume that they will be comfortable in every room of the house. Unfortunately, this simple desire cannot be addressed solely by a great envelope system. To achieve comfort in every room, focused attention must be paid to proper design and installation of the HVAC system.
Friction Rate The friction rate tells us how much friction our ductwork should produce, per 100’, so that we consume the rest of our available
