An Easy Retrofit for Return Air

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For homes without dedicated return grilles in the bedrooms, this easy-to-install device provides a return air pathway

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Your bedroom really doesn’t aspire to be a balloon. Yet, because of the way your heating and air conditioning system was installed, it may be acting like one. At least to an extent. It doesn’t expand the way a balloon does, but it does get blown up.

Think about it. If your bedroom has a supply register from your HVAC(Heating, ventilation, and air conditioning). Collectively, the mechanical systems that heat, ventilate, and cool a building. system but no return grille or other pathway for the air to make its way back to the unit, what happens to that air blowing into the room when you close the door?

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An Easy Retrofit for Return Air

Prime: 
prime

Subtitle: 
For homes without dedicated return grilles in the bedrooms, this easy-to-install device provides a return air pathway

Images: 

Your bedroom really doesn’t aspire to be a balloon. Yet, because of the way your heating and air conditioning system was installed, it may be acting like one. At least to an extent. It doesn’t expand the way a balloon does, but it does get blown up.

Think about it. If your bedroom has a supply register from your HVAC(Heating, ventilation, and air conditioning). Collectively, the mechanical systems that heat, ventilate, and cool a building. system but no return grille or other pathway for the air to make its way back to the unit, what happens to that air blowing into the room when you close the door?

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Designing Duct System Vents for Good Air Flow

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Finding the right balance of quantity, mixing, and noise

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You’re at a cocktail party when, as it so often does, the discussion turns to HVAC(Heating, ventilation, and air conditioning). Collectively, the mechanical systems that heat, ventilate, and cool a building. design. What do people talk about? Load calculations. Manual J. Oversizing. Maybe a little about duct sizing or location. But how many times have you been in that conversation and heard someone talk about what happens at the end of the ducts? Yes, I’m talking about the often overlooked part of HVAC design in which the designer selects the proper terminations for the duct runs.

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Designing Duct System Vents for Good Air Flow

Prime: 
prime

Subtitle: 
Finding the right balance of quantity, mixing, and noise

Images: 

You’re at a cocktail party when, as it so often does, the discussion turns to HVAC(Heating, ventilation, and air conditioning). Collectively, the mechanical systems that heat, ventilate, and cool a building. design. What do people talk about? Load calculations. Manual J. Oversizing. Maybe a little about duct sizing or location. But how many times have you been in that conversation and heard someone talk about what happens at the end of the ducts? Yes, I’m talking about the often overlooked part of HVAC design in which the designer selects the proper terminations for the duct runs.

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The Fundamentals of Rigid Duct Design

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Observe these principles of fluid flow to deliver the right amount of air

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At the end of this month, I’m giving a little presentation at the ASHRAEAmerican Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE).
International organization dedicated to the advancement of heating, ventilation, air conditioning, and refrigeration through research, standards writing, publishing, and continuing education. Membership is open to anyone in the HVAC&R field; the organization has about 50,000 members.
conference in Las Vegas. Actually, I’m doing one third of the whole presentation, which is titled Flex Ducts, Hard Ducts and No Ducts: Migration Patterns for Duct Hunters (or not) in the Land of Thermal Comfort. My part is on hard ducts.

Chris VanRite is doing flex duct, and Robert Bean will cover the no-ducts part (which doesn’t refer to ductless minisplits but rather to hydronic distribution). We get 15 minutes each, so I’ll elaborate on my part a bit here.

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