Premium Choice Low Profile Humidity Sensor Module Manual

Floor Area

(sq. ft.²)

Number of Bedrooms

1 2 3 4 5

CFM Requirements

<500 30 38 45 53 60

501-1000 45 53 60 68 75

1001-1500 60 68 75 83 90

1501-2000 75 83 90 98 105

2001-2500 90 98 105 113 120

2501-3000 105 113 120 128 135

3001-3500 120 128 135 143 150

3501-4000 135 143 150 158 165

4001-4500 150 158 165 173 180

Local Exhaust Requirement

A local mechanical exhaust system shall be

installed in each kitchen and bathroom:

• Kitchens: 100 CFM intermittent or 5 ACH

continuous (based on kitchen volume)

• Bathrooms: 50 CFM intermittent or 20 CFM

continuous

Use a PC Premium Choice Bath Fan in each

bathroom to meet the ASHRAE 62.2 Local

Exhaust Requirement. Please note each

bathroom fan counts towards meeting the

ASHRAE 62.2 Whole Building Requirement.

Whole Building Requirement

Required ventilation is based on the size of the

house and number of expected occupants.

1. Calculation:

Minimum Required CFM = 0.03A +

7.5(Number of bedrooms +1)

If the number of occupants exceeds the

assumed 2 persons for the rst bedroom

and 1 for each additional room, increase

the ventilation rate as follows: Number of

additional occupants x 7.5 CFM

2. Use the Whole Building Ventilation

Requirements CFM chart from the ASHRAE

62.2 Standard:

ASHRAE 62.2

The ASHRAE 62.2 Standard applies to all residential spaces that are “intended for human

occupancy” in single family homes and multi-family structures up to three stories. These spaces

include living rooms, bedrooms, kitchens, bathrooms, hallways, closets, store rooms, laundry

rooms, garages, and basements.

There are two components of the ASHRAE 62.2 standard that relate to ventilation fans: Whole

Building Ventilation & Local Exhaust.