Core TradesQuestion 196 of 700
What is a common MINIMUM intermittent exhaust airflow required for a residential bathroom fan?
a.20 cfm
b.50 cfm
c.100 cfm
d.150 cfm
Explanation
A bathroom exhaust fan operated intermittently is commonly required to move at least 50 cfm to clear moisture. 20 cfm is the typical continuous rate, while 100 and 150 cfm exceed the minimum required for intermittent bathroom exhaust.
Law Reference: 2025 CA Mechanical Code, Chapter 4 (Ventilation) / ASHRAE 62.2Practice all 700 questions free — no signup required.
Related questions on this topic
- Under current California requirements, newly constructed dwellings must generally provide:
- Using the all-outdoor two-permanent-opening method at a rate of 1 square inch per 4,000 Btu/hr per opening, what is the MINIMUM net free area of EACH opening for a 100,000 Btu/hr furnace?
- Under the California Energy Code, sealing forced-air duct systems is required PRIMARILY to:
- What is the typical MINIMUM clearance to combustible materials for a single-wall metal vent connector on a fuel-burning appliance?
- A ducted residential kitchen range hood that exhausts to the outdoors is commonly required to move a MINIMUM intermittent airflow of about:
- A roof has 2,400 square feet of surface area to be covered with three-tab asphalt shingles. At 3 bundles per square (100 sq ft), how many bundles are needed before adding any waste allowance?
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against California CSLB General Building (B) Trade Examination · How we review