Clearances for servicing all unit heaters shall be______.

Clearances for servicing all unit heaters shall be______.

• A. 30 inches
• B. in accordance with manufacturer's installation instructions
• C. 18 inches
• D. 24 inches

Answer: (B)

Clearances for servicing unit heaters are determined by the manufacturer’s installation instructions. The manual specifies the exact space needed to safely access controls, service disconnects, and components, as well as to accommodate venting, combustion air, and any clearance to combustibles. Since different models have different access panels and layouts, following the manufacturer ensures safe maintenance, proper operation, and compliance with warranty and code requirements. Generic fixed distances aren’t universally correct because they don’t account for the variability in unit designs. If the manual isn’t available, consult the applicable code or authority having jurisdiction to determine the default minimums, but the standard practice is to follow the manufacturer’s guidance.

Clearances for servicing unit heaters are determined by the manufacturer’s installation instructions. The manual specifies the exact space needed to safely access controls, service disconnects, and components, as well as to accommodate venting, combustion air, and any clearance to combustibles. Since different models have different access panels and layouts, following the manufacturer ensures safe maintenance, proper operation, and compliance with warranty and code requirements. Generic fixed distances aren’t universally correct because they don’t account for the variability in unit designs. If the manual isn’t available, consult the applicable code or authority having jurisdiction to determine the default minimums, but the standard practice is to follow the manufacturer’s guidance.