Bryant HEAT RECOVERY VENTILATOR HRVBB Troubleshooting Guide download pdf (Page 9)

How much ventilation does your

home need?

The capacity of a home’s ventilation system is usually based on

the number of rooms in the house. HRV capacity is measured in

litres per second (L/s), or cubic feet per minute (cfm), of fresh air

provided to the home.

Using the information in Table 2, you can calculate how much

fresh air your home needs under normal circumstances to maintain

good air quality.

TABLE 2

Fresh air requirements per room

Room Ventilation air supply

Master bedroom 10 L/s (20 cfm)

Unﬁnished basement 10 L/s (20 cfm)

Other rooms 5 L/s (10 cfm) each

Based on these ﬁgures, a ten-room home (unﬁnished basement,

living room, dining room, family room, kitchen, two bathrooms,

master bedroom and two bedrooms) requires an HRV with a rated

capacity of 60 L/s (120 cfm).

To ensure adequate ventilation, the HRV’s ventilation capacity

at high speed should be close to this total (see “High-speed

operation,” page 18). The suggested low-speed HRV ventilation

rate should be from 40 percent to 60 percent of the high-speed rate.

HRVs with high-efﬁciency motors (see “High-efﬁciency motors,”

page 12) can operate at lower speeds, based on demand.

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Bryant HEAT RECOVERY VENTILATOR HRVBB Troubleshooting Guide Page 9