MTD 248-604A Manual de instalación descargar pdf (Pagina 9)

IM 1083 Self-Contained WSHP Unit Ventilator Models ARQ, ERQ, GRQ Page 9 of 42

Figure 9: Horizontal and Vertical Blade Louvers, Without

Flanges With Grille or With Flange Without Grille

VentiMatic

™

Shutter Assembly

In many installations, an AAF

-HermanNelson

VentiMatic Shutter

Assembly is specied. See gure 10. This one-way shutter is a

continuously variable, gravity actuated, room exhaust vent that operates

in direct response to positive static pressure. It opposes any airow into

the room and allows a slight positive pressure.

It is important that the VentiMatic shutter and unit ventilator louvers

are mounted on the same wall. This neutralizes the effect of the wind.

Forcing excess air into the room through the unit ventilator louver

overcomes the same wind pressure that works to keep the VentiMatic

shutter closed. This prevents room air exhausting from the room through

the VentiMatic shutter.

Figure 10: VentiMatic Shutter Assembly

Note: Birdscreen and louver are shipped in one (1) piece.

Outside

Louver

VentiMatic Shutter

Roomside

Relief Air

Wall Openings, Louvers, and VentiMatic

Shutter

Self-Contained Floor Models ARQ, ERQ, GRQ are typically installed

in front of a wall opening containing a properly sized louver that is

designed to let in outside air while preventing water (such as rain) from

getting past the louver and into the unit itself. A weather-tight seal

keeps unwanted air and moisture from entering the occupied space. See

Figures 8 through 23, and table 1 for various louver details.

Figure 8: Horizontal and Vertical Blade Louvers, Without

Flange, (see Caution below for louver blade orientation

and drainage)

Vertical Blade Louver

Horizontal Blade Louver

Outside Air

Bird Screen On Side Toward Unit

Bottom

Bird Screen On Side Toward Unit

Locate Drain Lip at bottom of vertical louver to allow proper

drainage. For horizontal louvers, the louver blades should face

down for proper drainage. Bird screen should always be on

side toward unit.

CAUTION

Louver drain lip

Grille/Louver with weep hole

Flange

Outside Air

Vertical Louver with Flange, without Grille

Horizontal Louver

without Flange,

with Grille

Rear of Horizontal Blade Louver with Birdscreens and Flange

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MTD 248-604A Manual de instalación Pagina 9

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