Technical FAQs 4

Does a duct system need to be airtight?

CMC E502.4.2 requires that all joints, seams, and penetrations of duct systems must be made airtight by means of mastics, gasketing, or other means. For duct systems located entirely in conditioned space, the ducts do not require insulation.

What are the mandatory minimums for duct insulation?

The mandatory minimums for duct insulation are discussed in Section 4.4.1.1. There is a prescriptive requirement for ducted systems that have cooling and a CFI ventilation system to have the fan efficacy verified. This can be opted out using the performance approach.

How deep should a duct containment system be buried?

Deeply buried containment systems must be installed such that the walls of the system are at least 7 inches wider than the duct diameter (3.5-inch clearance on each side of duct) extend at least 3.5 inches above the duct outer jacket, and the containment area surrounding the duct must be completely filled with blown insulation.

What duct construction measures are required in California?

The mandatory duct construction measures referenced in Section 4.4.1 above state that duct installations must comply with the California Mechanical Code Sections 601, 602, 603, 604, 605, and the applicable requirements of the Energy Code.

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