Residential Attic HVAC Equipment July 2013

2012 Codes

On the plans show details of equipment installed in the attic. The following provisions should be considered. M1305.1.3

Lighting and receptacle outlet: Must be provided per IRC M1305.1.3.1. Note: See IRC section M1307.2 for or other appliance seismic support and attachment of a furnace installed within attic trusses. In attic furnace installations, where the unit is not rigidly Equipment disconnect switch attached to the structure, lateral bracing must be provided - typically straps running at a 45 angle from each corner of the unit to rigid Service area: framing members and tight Level, at least 30 inches enough to prevent horizontal deep and 30 inches wide, movement. Concerns about on all sides of appliance vibration must be addressed where access is required. with isolation devices, not by omitting required supports. 30"

Clearances from combustible construction: 24" Per manufacturer's installation instructions: may require 26 gauge steel pan over plywood decking.

Light switch near Passageway: access opening To be unobstructed, have continuous solid flooring not less than 24 inches wide. Distance from Note: access to equipment Combustion air is Trusses: required to be Attic access: cannot exceed 20 feet. required for all fuel designed for load bearing. Large enough for burning appliances removal of largest (IRC M1701.1). Insulation: insulation and appliance, with a ventilation space is required minimum of 22 below. inches by 30 inches opening.

This tip sheet reflects code requirements per the 2012 International Residential Code (IRC). The intent of this sheet is to provide a general understanding of the requirements and does not address the subject in great detail. Additional information can be found at you local department.