Combustion Appliance Present In Dwelling; Deal Location Of The Nit - Humidex UNS-103 Installation & Owner's Manual

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Table of Contents

With the presence of appliances evacuating air outside the building envelope (such as range hood,

bathroom fan, dryer, Humidex, etc.) a negative pressure could be created inside the building. As the

pressure inside the building gets lower than the barometric pressure outside, the smoke and gases

from any combustion appliance (oil furnace, gas/wood stove, fireplace, etc.) may be drawn into

the building rather than go out the chimney.

This problem is usually curable by setting the controls of exhaust appliances, including the Humidex

at less than maximum speed during the heating season (Note: when humidity conditions in the

home are below the humidity setting on the Humidex, as they usually are during the heating season,

the Humidex operates at approx. 25% of the capacity of a standard bathroom fan), or by

introducing make-up air inside the building. A fresh air kit (Air Supply Ventilator) is available from

your Humidex dealer, to help relieve the effects of negative air pressure in the building.

Ideal location of the Unit

Air drawn in by Humidex pulls moisture off the surface floors and walls. To maximize the

effectiveness;

A) Install unit in dampest, coolest and lowest part of basement.

B) If possible, without hindering point "A", install the Humidex as far away as possible from

the source of replenishment air (i.e. stairwell) from upstairs or from replenishment air grill in

crawl space area. This will allow for the unit to draw in the maximum moisture across the

greatest surface distance before the upstairs replenishment air is pulled into the unit.

Keep away from sources of excess heat (i.e. furnace room).

Unit must be installed all the way down to floor level, in order to draw in the moisture. It

should be approx. 3" and must not be higher than a max of 6 inches off floor level.

Keep at least 8 feet away from furnace or combustion appliance, to avoid interfering with

airflow.

The area (not less than 4 ft.) around the unit should be clear to allow the air to be pulled into the

vents.

Humidex

Warning!!!