Heat exhaust

[milkyway]

Got a question, I am going to be installing a hood system for heat removal only, no problem, I am going to mount the hood then run square duct to the mushroom exhaust fan, now my question is that I will not be going through roof but side wall exit , now that being said, when I exit the side wall , you guys think that I 45 then 45 to make a 90 then mount fan, or should I just do be 45 , just wondering , for cosmetics, I have seen both,
What is all ur guys and gals

[VTP99]

Will it need cleaning down the road ?

[milkyway]

Maintenance is always good, but it's not a grease hood,

[VTP99]

I know owners that say the hood cleaners do not like the wall mount.

[milkyway]

And I can understand why, with vertical applications, water will flow down, with side wall or horizontal applications water tends to sit,

[SandShark]

Cosmetically or aesthetically, I'd prefer to see it mounted on the 90. Have you thought about just installing a sidewall exhaust fan? That way, no duct work outside to worry about.

BTW, how high off the ground will it be? The AHJ may have something to say about how it's installed and it being accessible for service. NFPA 96 (Standard for Ventilation Control and Fire Protection of Commercial Cooking Operations) states:

A.7.8.2.2 Both types of fan terminations should be accessible
as follows:

(1) Rooftop Terminations. All roof exhaust fans (whether
through the roof or to the roof from outside) should have
ready access to all sides from a flat roof surface without a
ladder, or they should be provided with safe access via
built-in stairs or walkway or a portable ladder to a flat work
surface on all sides of the fan (see 7.8.2).

(2) Wall Terminations. All through-the-wall exhaust fans
should have ready access from the ground from no more
than a 2-m (6-ft) stepladder or should be provided with a
flat work surface under the fan that allows for access to all
sides of the fan, accessible from no more than a 6.0-m
(20-ft) extension ladder (see 7.8.3).

[milkyway]

Uh o., ok thanks for the input

[dlove]

Uh o., ok thanks for the input

I did a hood for heat, I was up against an outside wall. I had the hood made of sheet metal secured the hood, mounted the fan inside for wall side exhaust put louver on outside. you can service fan from inside. but check with the building code guys. and read the local code yourself.