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H H <br />N � <br />C M <br />7 H m <br />� � � <br />omo <br />�q M �tl <br />� H � <br />°zno <br />n :° � <br />7 H � <br />. <br />O N y <br />°nor~n <br />�t9� <br />H O N <br />� <br />� �'.: <br />I =- <br />� �s <br />� <br />. <br />.., <br />(� Makeup Air. Air exhausted from spraying operations shall not be recircu- <br />lated. <br />The mechanical ventilation system shall have air intake ducts extended to pick up <br />flammable vapor within 6 inches of the floor. <br />� <br />Section 45.206 (� has two requirements. First, exhaust air is not permitred to be recirculated. <br />Second, because flammable vapors aze heavier than air, the exhaust system u�ust be able to pi�k up <br />flammable vapor within 6 inches of the floor of the spray area. � . <br />r? <br />(g) Air Velocity. The spraying operations shall be so designed, installed and ;?� <br />maintained that the average air velocity over the open face of the booth tbr booth <br />cross section, in direction of airtlow, during spraying operations) shall noZ be less ,. <br />than lIXl lineal feet per minute. '. ' � <br />To ensurc that flammable vapors aze kept within a designated spray azea and that overspray is kept ' <br />frnm setiling, the Fire Code requires that the e�chaust system be adequately sized to maintain an <br />average velocity overthe open face of the booth orbooth cross section to not less than 1001ineal feet <br />per minute. <br />AIR VEL.._.. . <br />WITHIN BOOTH <br />SHALLNOTBE <br />LESSTHAN <br />100 LItdEAL FEET <br />PER MINUTE' <br />�F <br />i� <br />100 LINEAL FEET <br />PER MINUTE <br />VELOCITY REQUIRED <br />TO KEEP OVERSPRAY <br />FROM SETTLING <br />SECTION <br />EXHAUST�YSTEM <br />SIZED TO PROVIDE <br />100 LINEAL FEET <br />PER MINUTE AIR <br />VELOCITY OVER <br />BOOTH CROSS SECTION <br />OR OPEN FACE <br />OFBOOTH <br />To calculate the required exhaust capacity, tl�e height and width of the bootl� must be measured. <br />Ortce the width and the height measurements aze known, multiply the width by the height. This <br />number represents the booth's cross-sectional area. Remember'ng the booth requires an air flow of <br />1001ineal feet per minute, multiply the cross-sectional uea fig�re by 100. The final answer provides <br />the required ventilation capaciiy in cubic feet per minute (cfm). <br />Ventilation Formula: <br />Booth Widt:� (ft) x 800th Height (fq x] 00 = Ventilation Capacity (cfm) <br />.::xatn�a���'Si�ar-.:.•"u+�Wtir�,.«.�+tu+� :wc.t:�.,,..rir.�w�T1i�a'�Nm:riuH�,;..,,;.G ,- .,...�.rm.-,��F�L:�: <br />IT , <br />