Load & DesignQuestion 13 of 110
What is the primary purpose of a Manual J block load versus a room-by-room load?
a.To size the refrigerant lines
b.To establish total equipment capacity for the whole structure
c.To determine duct insulation R-value
d.To calculate the gas meter size
Explanation
A block (whole-house) load establishes the total heating and cooling capacity the equipment must provide. A room-by-room load then distributes that capacity to size individual ducts and registers. Both are needed for a complete design.
Practice all 110 questions free — no signup required.
Related questions on this topic
- Which factor increases a building's cooling load the most on a hot afternoon?
- In California, plans for new HVAC systems typically must demonstrate compliance with which energy standard?
- Under the California Mechanical Code, when is a permit generally required for HVAC work?
- If a home has a calculated cooling load of 30,000 BTU/hr, what nominal equipment size is the closest match?
- Friction rate in duct design is typically expressed in which units?
- Air velocity in a duct is calculated by dividing airflow (CFM) by what?
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against California CSLB C-20 Warm-Air HVAC Trade Exam · How we review