PG96MSA: Installation, Start-up, Operating and Service and Maintenance Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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Example 2
A direct-vent 60,000 BTUh furnace installed at 2100 ft. (640M). Venting system includes FOR EACH PIPE:
100 feet (30 M) of vent pipe, 95 feet (29 M) of combustion air inlet pipe, (3) 90º long-radius elbows, and a polypropylene concentric vent kit. Also
includes 20 feet (6.1 M) of flexible polypropylene vent pipe, included within the 100 feet (30 M) of vent pipe.
VERIFY FROM POLYPROPYLENE VENT MANUFACTURER’S INSTRUCTIONS for the multiplier correction for flexible vent pipe.
Can this application use 60mm o.d. (2”) polypropylene vent piping? If not, what size piping can be used?
AIR DELIVERY - CFM
Measure the required linear length of RIGID air inlet and vent pipe; insert the longest of
the two here: 100 ft. Of rigid pipe - 20 ft. Of flexible pipe
= 80 ft.(24 M)
Use length of the longer of the vent
or air inlet piping system
Add equiv length of (3) 90º long-radius elbows (use the
highest number of elbows for either the vent or inlet pipe)
3 x 5 ft.(1.5 M) = 15 ft.(4.6 M)
Example from polypropylene vent
manufacturer’s instructions, Verify from
vent manufacturer’s instructions.
Add equiv length of 45º long-radius elbows
(use the highest number of elbows for either the vent or
inlet pipe)
0 x = 0 ft.(0 M)
Add equiv length of factory concentric vent term 9 x 3.3 ft(0.9 M) = 30 ft.(9 M)
Add correction for flexible vent pipe, if any 2* x 20 ft.(6.1 M) = 40 ft.(12.2 M)
* VERIFY FROM VENT MANUFACTURER’S INSTRUCTIONS; For example only, assume 1 meter of
flexible 60mm (2”) or 80mm (3”) polypropylene pipe equals 2.0 meters (6.5 ft.) of PVC/ABS pipe.
Total Equivalent Vent Length (TEVL) 165 ft.(50 M) Add all of the above lines
Maximum Equivalent Vent Length (MEVL) 95 ft.(29 M) For 2” pipe from Table 14
Is TEVL less than MEVL? NO
Therefore, 60mm (2”) pipe may NOT be
used; try 80mm (3”)
Maximum Equivalent Vent Length (MEVL) 185 ft.(57 M) For 3” pipe from Table 14
Is TEVL less than MEVL? YES Therefore, 80mm (3”) pipe MAY be used
Table 18 – Air Delivery - CFM (with filter)
Unit Size
Airflow
Setting
Default
Setting
External Static Pressure (IN.W.C.)
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
30026A
1 Cont. Fan 470 395 320 250 175 - - - - -
2 510 445 370 305 240 165 - - - -
3 535 470 400 335 275 200 130 - - -
4 560 495 430 365 310 245 170 - - -
5 595 535 470 405 350 295 225 155 - -
6 Heat 620 560 500 435 375 320 265 195 130 -
7 665 605 550 490 430 380 330 270 205 140
8 705 650 600 540 480 430 380 335 280 215
9 745 695 645 590 535 480 435 385 340 285
10 785 735 685 635 585 530 480 435 390 350
11 820 775 730 680 630 575 525 485 440 400
12 855 810 765 720 675 620 570 525 485 445
13 890 845 800 755 710 665 615 570 530 490
14 945 905 860 820 775 735 690 640 595 560
15 980 940 900 860 820 780 735 690 645 605
16 1025 985 950 910 870 830 795 750 710 665
17 1065 1030 995 955 920 880 845 805 760 720
18 Cooling 1115 1080 1045 1010 970 935 900 865 825 785
30040A
1 Cont. Fan 390 335 275 215 155 - - - - -
2 405 355 300 240 185 125 - - - -
3 455 405 355 305 250 200 140 - - -
4 485 440 390 345 295 245 190 140 - -
5 530 485 440 395 350 300 255 205 155 -
6 565 525 485 440 400 355 310 270 220 170
7 600 560 520 480 440 400 360 320 275 230
8 645 605 570 530 495 455 415 375 335 300
9 Heat 705 665 630 595 560 525 490 455 415 380
10 720 685 650 615 580 545 515 480 440 405
11 760 730 695 660 630 595 560 530 495 460
12 820 785 755 725 690 660 630 600 570 535
13 865 835 805 775 745 715 690 660 630 600
14 910 885 855 825 800 770 740 710 685 655
15 965 935 905 880 855 825 800 770 745 715
16 1005 975 950 925 900 870 845 820 795 765
17 1055 1025 1000 975 950 925 900 875 850 825
18 Cooling 1100 1075 1050 1025 1000 980 955 930 905 880
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