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ASHRAE 62.2 Ventilation Guide

The document discusses how to calculate the required amount of ventilation according to ASHRAE 62.2 for new construction. It explains the two main types of ventilation as local ventilation from exhaust fans in bathrooms and kitchens, and whole-building ventilation through outside air exchange. It provides the specific requirements for local ventilation and breaks down the calculation for whole-building ventilation requirements based on the number of bedrooms and square footage.

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Taha Mustahsan
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530 views2 pages

ASHRAE 62.2 Ventilation Guide

The document discusses how to calculate the required amount of ventilation according to ASHRAE 62.2 for new construction. It explains the two main types of ventilation as local ventilation from exhaust fans in bathrooms and kitchens, and whole-building ventilation through outside air exchange. It provides the specific requirements for local ventilation and breaks down the calculation for whole-building ventilation requirements based on the number of bedrooms and square footage.

Uploaded by

Taha Mustahsan
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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ASHRAE 62.

2 for New Construction – How


to Calculate the Required Amount of
Ventilation
ASHRAE 62.2, the residential ventilation standard, is now required by ENERGY STAR Version 3, as
well as the Department of Energy for all federally funded weatherization projects. If you’re in the
business of HVAC systems, this should be good news for you! You have extra ammunition in selling
air quality to your clients! There are a lot of ways to satisfy ASHRAE 62.2 requirements. So, it’s
important that you understand exactly what is required, as well as what’s not.
If you’ve tried to read the formal ASHRAE 62.2 document, you’ll know that it’s certainly written by
engineers. Which is a good thing, because those folks are smart. But, it’s not all that easy to
understand. So, I’ll break it down for you nice and simple.
ASHRAE 62.2 Ventilation Types

ASHRAE 62.2 was developed with the idea of making


houses healthier for the occupants. ASHRAE 62.2 aims to do so by dealing with two main types of
ventilation:
1. LOCAL VENTILATION: Exhausting pollutants from a point close to the source (bath and kitchen
fans).
2. WHOLE-BUILDING VENTILATION: Introduce outside air into the home to dilute pollutants found in
the inside air (The same reason you’d want to roll down the window if you were trapped in a car with
a chain smoker – air exchange).
It’s All About Quantity
That’s really all there is to it. But, it’s crucial that you have the correct quantity of ventilation air for
each of these two categories.
Here’s how ASHRAE 62.2 breaks down LOCAL VENTILATION requirements:
1. Bathrooms = Minimum 50 cfm of intermittent ventilation or 20 cfm of continuous ventilation.
2. Kitchens = Minimum 100 cfm of intermittent ventilation or 5 air-changes-per-hour of continuous
ventilation.
And, here’s how ASHRAE 62.2 breaks down WHOLE BUILDING VENTILATION requirements:
1. Take the number of people x 7.5 cfm. Use the number of bedrooms + 1 to determine the number of
people. (example: 3br house = 4×7.5 = 30cfm)
2. Take 1% of the square footage of the house and add it to the number you got in step 1. (example:
1800 sqft house = 18cfm, 2200 sqft house = 22 cfm, etc.)
That sums up how to calculate the quantity of ventilation needed by ASHRAE 62.2for a given
residence. The next part of the equation is to select the right solution to ensure that you’re providing
the needed ventilation in a way that satisfies your client’s needs. We’ll address that in a future post.

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