Ashley 1440E, Owner'S Installation And Operation Manual

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Duct Work Installation

We  strongly  recommend  that  the  hot  air  ductwork  be  installed  by  a  home  heating  specialist.  If  doing  the 

installation yourself, before you decide which installation will best suit your needs, consult a qualified heating 

technician and follow his recommendations as to the safest and most efficient method of installation.

This furnace can be installed in three ways, as a stand alone unit, parallel, and in series with an existing furnace.

SUPPLY AIR (HOT AIR) PLENUM

The warm-air supply duct shall be constructed of metal in accordance with NFPA 90B, 2-1.1. The plenums installed 

to the furnace shall be constructed of metal in accordance with NFPA 90B, 2-1.3.

When installing this furnace the hot air plenum is to have a minimum height of 24” (610mm) if the top of the first 

vertical section is not flush with the top of the first horizontal section of ductwork. If the top of the plenum is flush 

with the top of the first horizontal section of ductwork then the minium height is 15” (381mm).

RETURN AIR (FRESH AIR)

The return (fresh) air intake on the furnace is on the rear of the unit. The ductwork must be mechanically attached 

to the unit or UFB908 blower box with sheet metal screws to ensure a proper operation.

STAND ALONE INSTALLATION

If installing this furnace as a stand alone unit, ensure all local codes and all instructions in this manual are followed, 

including clearance to combustibles, floor protector specifications and safety warnings.

24-1/16”

6”

Supply Air (Hot Air) Duct Work Outlet Size

Supply Air Plenum Minimum 

Height Of 24”

Supply Air Plenum With 

Minimum Height Of 15”