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<br />DETECTOR PLACEMENT <br /> <br />DetectDrs are required over cooking appliances and In the <br />dUcl(s) Or protecled venlllallon hoods. Detectors shall be <br />localed In the plenum area of [he venllla!lon hood. <br /> <br />Exhaust Duct(s). <br /> <br />Each exhausl duct must have at least one (1) deleclor <br />Installed In the duel entrance, located In (he air streem of lhe <br />cooking vapDrs al a maximum Df 12 feel (3.7 m) Into the <br />· ducl. See Figure 3-23. <br /> <br />--... .rt=- :I' ~ __ __ <br />~: ..-.. -:::v)J"-' 0= _ <br /> <br />I <br />12 FT. (3.7 m) <br />MAXIMUM <br /> <br />~ <br /> <br />Figure 3-23. <br />OOlllt.4PC <br /> <br />NOTICE <br />When gas appliances are used and the flue gases frDm <br />the burner are exhausted Inlo the ducl, Ihe deleclDr must <br />be kepI oul of the air stream of lhese exhausl gases. <br />These gaseB can be very hol and cDuld acluale lhe <br />syslem unnecesserily. <br /> <br />Duct openIngs lhal are long and narrDW or large enDugh <br />10 require mull/pie duel nDzz/es may require addlllonal <br />deleclors. <br /> <br />Electrostatic Precipitator. <br /> <br />If an eleclroslaUc precipitator Is localed al or near lhe base of <br />Ihe exhausl duel, it Is necessary to locale a detector below Ihe <br />precipitator, althe base of the ducl, and a/sD locate one In the <br />ducl, Just above Ihe precipitator. See Figure 3-23a. <br /> <br />When Installing Ihe deteclor bracket and syslem conduit make <br />certain they do not inlerfere with the opera lion of the ' <br />. preclp/lalor. <br /> <br />Chapter 3 - System Design <br />Page 3-19 <br />REV. 1 <br /> <br />t <br /> <br /> <br />.. <br /> <br />Figure 3-23a. <br />...".. <br /> <br />CookIng Appllance(s). <br /> <br />Eech cooking eppllance wllh a conllnuous cooking surface <br />nDI exceeding 48 In. x 48 In. (122 x 122 cm) shall be <br />prolecled by one (1) deteclor. CookIng eppllances with a <br />conUnuDus cODklng surface exceeding 48 In. x 48 In. (122 x <br />122 cm) shall be protected by one (1) deteclor per 40 In. x <br />48 In. (122 x 122 em) cooking area. Detectors used for <br />· cooking appliances musl be lOCated. above the protecled <br />appllanca toward the exhaust duel side of the appliance. The <br />delectDr should be IDcaled In the air stream of the appliance <br />10 enhance syslem response lime. <br /> <br />/( a cDoklng eppllance 15 located under a ducl opening where <br />a de lector has been mounted, Ills nol necessary to ulillze <br />an add/lional deleclor provided the ducl de fee lor Is nDt more <br />lhan 12 In. (31 em) Into the duct opening. If two (2) appli- <br />ances are loceled under a duct opening where a de(eclor <br />haB been moun(ed, Ills not necessary 10 ul1l1ze an addllfonal <br />delector provided lhe ducl de(ecfDr Is nol more than 12 In. <br />(31 cm) Into fhe ducl Dpenlng. See Figure 3-24. <br /> <br />~-l__________ <br /> <br />F"""V <br />(~) <br /> <br />I~ <br />(a) <br /> <br />f='l <br />(C) <br />'....J <br /> <br />APPLIANCE APPLIANCE APPLIANCE APPLIANCE <br />COVERED COVERED <br />BY BY COVERED COVERED <br />OETECTOR DETECTOR BY BY <br />^ a DeT&CTOR DETeCTOR <br /> B C <br /> <br />FIgure 3-24. Proper Detector Placement. <br />ool.....'PO <br /> <br />PN551274(3) <br /> <br />ULEX 3830 <br />Augus( 1, 2005 <br />