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MRY-25-2000 21�54 <br />Nalbach Construction <br />2132 Highland Avenue Everett, WA 98201 <br />(425) 252-7450 Phone (425) 339-2317 Fax <br />To: Ken Jackson <br />Re: Mechanical Ventilation for 812 Hoyt — Roberts Job <br />P.91 <br />Nalbach Consuuction proposes to use a Nutone QT130 fan with a whole house fan timer to m:et <br />the mechan:cal ventilation requirements for the S 12 I-Toyt recreatioa room Calculations: <br />� 5' �{ 35' i; T high = 3675 cuUic feet. <br />Netone QT130: 130 cubic feet/minute X 60 minutes = 7800 cuuic feet per hour. <br />This would provide two air chanp,es per hour. We assume air infilttation would provide the <br />incoming air. <br />Nalbach Construction questions the two air changes per hour requirement per the attached <br />approved plan. We thought the requirement for a whole house fan was .35 minimutn a'v changes <br />per hour and .50 maximum air ehanges per hour. <br />Larry Nalbacl� <br />� �� <br />Post-IY Fax Note <br />ro k iGw� a f�-X <br />7s7t �a,as 11-c vec�g' t- <br />�' F'OR1 (JtR�C y c/S� <br />�fT Co.N�lC��1I Cv.�J T <br />PnoneM yf� ��liU <br />>'G �"" 335 i3�� <br />