If a space is ventilated through an exhaust fan (rate according VRP) and a permanently open vent to the outdoors, can this space be considered mechanically ventilated, 100%OA and can use an Ez of 0,8 if exhaust fan is in the opposite side of the room of the vent?

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Andrew Mitchell, P.E.

Principal

Mitchell Gulledge Engineering, Inc.

LEEDuser Expert

97 thumbs up

Tue, 09/15/2015 - 15:24

According to Table 6-2, the above would be correct.

Emmanuel Pauwels

Owner

Green Living Projects

LEEDuser Premium Member

107 thumbs up

Tue, 09/15/2015 - 16:07

Thank you Andrew for the quick answer. I had this doubt because from some previous comments seemed that outdoor air should be provided by a supply system in order to consider the zone as mechanically ventilated.

Gustavo De las Heras Izquierdo

LEED Expert

LEEDuser Basic Member

169 thumbs up

Tue, 09/15/2015 - 21:12

Hi Andrew, 1.Is the project allowed to have operable windows instead of permanently opened vents? Air would infiltrate through cracks and doors. 2.The project will not be capable of providing MERV13 filters. Is the project still eligible to pursue credit IEQc5?

Andrew Mitchell, P.E.

Principal

Mitchell Gulledge Engineering, Inc.

LEEDuser Expert

97 thumbs up

Tue, 09/15/2015 - 21:15

1. No, unless they are interlocked to automatically open when the fan is on. 2. No.

Gustavo De las Heras Izquierdo

LEED Expert

LEEDuser Basic Member

169 thumbs up

Wed, 09/16/2015 - 15:11

1.Is this requirement based in a LEED Interpretation or addenda? This would be very helpful in order to explain the client. 2.I agree.

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