WA9302A-SP 960320 (3)North Texas Municipal
Construction Company, Inc.
SUBMITTAL NO. 15821-01 5614 Dyer St.
Dallas, Texas 75206
City of Coppell 214/368-6880
Village Parkway Pump Station FAX 214/368-4950
Specification:
[] NO EXCEPTIONS TAKEN.,
[] RLIECTED [] REVISE AND RESUBMI
~ SUBr~H SPECIFIED iT M
Correcttons or comments made on the shop Orawmgs dur-
ing th s review ~o not relieve contracto~ r~m comphGnce
w~th requirements ot the drawings and sp~cd~cahons. ~S
check ~s only for ~ewew Of general COntormGnce wtth the
design concept of the prOlect an~ general Comphance w~th
the ntormahon ~ yen ~n the contract documents The
contractor ~s ,es~onstble lot confirming and correlattng
all quar, tmes and d mens~ons~ selecting ~abr;cat,on pr~-
esses anO techmques of construct,on. coordinahn9
work wHh that of all other trades. anO ~ertorm~ng h~s
work in a Sate anO sat,s~actory manner
McCBEARY & ASS~CIAT~, INC.
CONSULTING ENGI EER~
Date '; ?c':; ~ C' B "'~
CONSTRUCTION * SALES · SERVICE
EFFECTIVE DATE 9/88
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F LAY-IN T-BAR
F DESIGN -- Model 12-P Return Diffusers are designed for :,
U flush type mounting in Surface or Lay-In T~Bar ceilings
S Frame 32 has screw holes for surface mounting. Frame 33
E is without holes for Lay-In T-Bar ceilings. 't
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S FEATURES -- Perforated diffuser face with trame.
Optional Opposed Blade Damper (OBD) is screwdriver
operated.
CONSTRUCTION -- Steel with white finish standard.
SCREW HOLES FOR FRAME 32 ONLY
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· '-'2 :. ;*; . COUNTERSUNIt. SCREW HOLES ' '~' '
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........ .~ ~m HOLES
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u PERFORATED FACE
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:.?:~;~:~:~.'-:.5~::-'~:.~:'::!;:! : .....DUCT s, ze PLUS W.'!' _,"I':': ',"
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.......... CEILING OPENING DUCT SIZE PLUS 13,-~''
PD2
PERFORMANCE DATA
MODELS 1290, 1274, 12-P, 12-P FF
Return Air Grille
Balancing Data
Neck Area
The cross-sectional area (sq. It.) of the duct at the point where the
diffuser is attached, all dimensions are nominal.
Neck Velocity
Air Flow Rate (CFM) divided by Neck Area (sq. ~.) equals Neck Velocity
Static Pressure
Static Pressure Drop is given in Inches of W.G.
To Determine CFM:
1. Use an ALNOR Velometer with No. 2220 or 2220A Tip or a 4"
rotating vane anemometer. if a 4" rotating vane anemometer is used,
p}ace dial face against perforated plate and sample in a random
mariner for at least 1 minute.
2. Se}ect proper Ak from Table by unit size and instrument used for
measuring ve}oci~.
3. Determine CFM by the following equation: CFM = Ak X Average
Sample Problem:
Determine Return Air flow Rate (CFM) through a 10 x 10, using an
AL~OR VeJometer with ~p No. 2220 or 2220A.
Solution:
1. Assume the ave~Ge of 6 ve}oci~ readings taken with an ALNOR
Velometer is 2000 fpm.
2. From Table, the Area Factor for a 10 x 10 using an ALNOR Velometer
is Ak = .39 sq. ~.
3. CFM = Ak x Average Veloci~ = .39 sq. ~. x 2000 fpm = 780 CFM
Neck Veloci~ 200 300 400 50~ 600 650 700 750 ~00 9~0
S.P. Drop .012 .027 .049 .078 ,11 A3 ,15 A7 A9 .24
. w/OBD
Size Ak Ak
ALNOR 4' ROT. Air Capacities - C.F.M
. ~ Vane .
10xI0 .39 .55 ~40 i 210 ~ 285 350 ~ 4~5 450 I ~85 ~ 520 ~ 555 625
12xl 2 A6 .79 200 300 400 500 600 650 700 75Q 800 900
14x14 .62 1.07 270 410 545 680 ~ 815 885 955 1020 ~ 1090
10x22 .71 1.21 305 460 610 765 915 995 1070 1150 1220 ~, 1375
~6x~6 .a2 ~.40 355 530 7~0 890 ' '1065 1155 1~45" 1335 i?:~.1425' ~:,~600'~.
lax18 1.05 1.77 450 675 "' 900 ~25 ~350 ~460 ~575 -,: 1690.'~'~lS00'
20x20 1.28 2.25 555 835 1110 ) 1390 1665 1805 1945 :~": 2080 ;"' '22207 ~: 2500
22x22 1.55 2.70 670 1010 1345 1680 2020 2180 : 2350 2520 2690 3020
NC sound data based on B db room a~enuation and sound power level re: l O-12 wa~s.
~ NC LESS THAN 30
~ NC LESS THAN 40
~ NO LESS THAN 50 NC SOUND DATA BASED ON 8 d9 ROOM A ~ENUA TION AND SOUND POWER LEVEL RE:
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