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Old 11-18-2009, 08:29 AM   #1
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male-female ends and flow direction


For bathroom exhaust and range hood exhaust is there a certain direction to install the ducting?

I am building our house and am at the stage where I need to get exhaust points installed in the soffits so the spray foam insulation contractor can do his job. I do not yet have the actual exhaust fans. I am working inside my roof trusses right near the top plate in a fairly tight soffit area.

I searched the forum and googled but is this just common sense?
Does ducting have male female end system and you always must point male end in direction of air flow? Or does foil ducting tape seal even when female end goes over male end?

Thanks for any clarification.

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Old 11-18-2009, 09:12 AM   #2
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male-female ends and flow direction


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Originally Posted by retiring2texas View Post
For bathroom exhaust and range hood exhaust is there a certain direction to install the ducting?

I am building our house and am at the stage where I need to get exhaust points installed in the soffits so the spray foam insulation contractor can do his job. I do not yet have the actual exhaust fans. I am working inside my roof trusses right near the top plate in a fairly tight soffit area.

I searched the forum and googled but is this just common sense?
Does ducting have male female end system and you always must point male end in direction of air flow? Or does foil ducting tape seal even when female end goes over male end?

Thanks for any clarification.
They are one and the same; female goes over male--male goes into female.

Sealing aside, the male end should point in the downstream (away from fan) direction.

Sealing is good, but a better question is, how do you know what size ducting to use? Too small, much noise. You should research fans and select ductwork size to suit.

V

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