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Drawing combustion air out of air sealed buildings – Is it safe?
Where gas appliances are located inside the thermal envelope, a sufficient amount of combustion air must be provided for the safe and complete combustion of natural gas fuels. As new buildings become tighter, it is imperative for design professionals to know that...
HVAC Systems, Ventilation, Filtration and COVID-19
As we approach two years of dealing with travel restrictions, shutdowns, zoom meetings, health concerns, masks, sickness, deaths, etc., it is an appropriate time to look closely at the buildings we live in and how building design, building codes, and specifically HVAC...
Foil-Faced Bubble Wrap Duct “Insulation”
As we continue to see ‘foil bubble insulation’ used incorrectly as duct insulation, it is time to separate the facts from the fiction. This is a critical issue as the improper installation of these products often increases the heat loss or gain by a factor of four,...
ACCA Residential HVAC Standards: Manual J – Load Calculations, Manual D – Duct Design, and Manual S – Equipment Selection: Part 5
Part 5: Infiltration and Ventilation Air - Impact on Load Calculation This discussion is the fifth in a series on the design a residential HVAC system in accordance with ACCA Manuals J, D, and S, as requirement by the ICC mechanical and energy codes. The focus is the...
ACCA Residential HVAC Standards: Manual J – Load Calculations, Manual D – Duct Design, and Manual S – Equipment Selection: Part 4
Part 4: Fenestration Windows, Doors, and Skylights – Impact on Heat Loss and Heat Gain The IECC (International Energy Conservation Code) include this definition: FENESTRATION. Products classified as either vertical fenestration or skylights. Skylight. Glass or other...
ACCA Residential HVAC Standards: Manual J – Load Calculations, Manual D – Duct Design, and Manual S – Equipment Selection: Part 3
Part 3: Thermal Factors R-values, U-factors & SHGCs – Consistency on all Construction Documents This discussion is the third in a series on the code requirements for the designing residential HVAC system in accordance with ACCA Manuals J, D, and S. The focus here...
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