Quick Selection Guide
BTUH Load
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| Floor | Usage |
| Usage |
| Usage |
| Usage |
| Usage |
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| Dimension | Sq. Ft. | Avg. | Heavy | Avg. | Heavy | Avg. | Heavy | Avg. | Heavy | Avg. | Heavy |
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| 6x6x8 | 36 | 4750 |
| 6389 | 4488 |
| 6037 | 4583 |
| 6505 | 4929 |
| 7041 | 5274 |
| 7577 |
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| 6x8x8 | 48 | 5417 |
| 7274 | 5119 |
| 6974 | 5225 |
| 7407 | 5630 |
| 8028 | 6034 |
| 8648 |
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| 6x10x8 | 60 | 6055 |
| 8100 | 5722 |
| 7655 | 5806 |
| 8213 | 6265 |
| 8911 | 6725 |
| 9609 |
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| 8x8x8 | 64 | 6188 |
| 8291 | 5848 |
| 7835 | 5934 |
| 8410 | 6405 |
| 9127 | 6876 |
| 9844 |
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| 8x10x8 | 80 | 6954 |
| 9269 | 6572 |
| 8759 | 6631 |
| 9363 | 7165 |
| 10169 | 7699 |
| 10974 |
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| 8x12x8 | 96 | 7669 |
| 10174 | 7247 |
| 9614 | 7273 |
| 10234 | 7867 |
| 11123 | 8461 |
| 12011 |
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| 8x14x8 | 112 | 8366 |
| 11045 | 7905 |
| 10437 | 7922 |
| 11092 | 8575 |
| 12059 | 9227 |
| 13026 |
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| 8x16x8 | 128 | 9051 |
| 11888 | 8553 |
| 11234 | 8528 |
| 11890 | 9237 |
| 12933 | 9946 |
| 13976 |
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| 8x18x8 | 144 | 9748 |
| 12732 | 9212 |
| 12032 | 9169 |
| 12732 | 9936 |
| 13852 | 10702 |
| 14972 |
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| 8x20x8 | 160 | 10419 |
| 13548 | 9846 |
| 12803 | 9755 |
| 13490 | 10576 |
| 14682 | 11397 |
| 15874 |
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| 8x22x8 | 176 | 11540 |
| 14807 | 10905 |
| 13992 | 10817 |
| 14715 | 11692 |
| 15977 | 12567 |
| 17239 |
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| 8x24x8 | 192 | 12224 |
| 15622 | 11522 |
| 14763 | 11386 |
| 15439 | 12314 |
| 16769 | 13242 |
| 18099 |
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| 8x26x8 | 208 | 12874 |
| 16398 | 12166 |
| 15496 | 11976 |
| 16176 | 12955 |
| 17573 | 13935 |
| 18970 |
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| 8x28x8 | 224 | 13519 |
| 17163 | 12775 |
| 16219 | 12530 |
| 16873 | 13562 |
| 18336 | 14594 |
| 19799 |
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| 8x30x8 | 240 | 14187 |
| 17947 | 13407 |
| 16960 | 13108 |
| 17587 | 14191 |
| 19115 | 15274 |
| 20642 |
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| 8x32x8 | 256 | 14824 |
| 18694 | 14009 |
| 17666 | 13653 |
| 18264 | 14786 |
| 19855 | 15920 |
| 21446 |
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| 10x10x8 | 100 | 7789 |
| 10339 | 7361 |
| 9770 | 7386 |
| 10401 | 7990 |
| 11304 | 8594 |
| 12208 |
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| 10x12x8 | 120 | 8626 |
| 11385 | 8152 |
| 10759 | 8138 |
| 11405 | 8809 |
| 12401 | 9481 |
| 13397 |
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| 10x14x8 | 140 | 9439 |
| 12384 | 8920 |
| 11703 | 8887 |
| 12405 | 9626 |
| 13493 | 10365 |
| 14581 |
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| 10x16x8 | 160 | 10250 |
| 13379 | 9686 |
| 12643 | 9577 |
| 13311 | 10379 |
| 14484 | 11182 |
| 15658 |
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| 10x18x8 | 180 | 11049 |
| 14349 | 10441 |
| 13560 | 10279 |
| 14216 | 11144 |
| 15472 | 12009 |
| 16728 |
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| 10x20x8 | 200 | 11838 |
| 15299 | 11187 |
| 14458 | 10942 |
| 15070 | 11868 |
| 16405 | 12794 |
| 17741 |
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| 10x24x8 | 240 | 13391 |
| 17180 | 12654 |
| 16207 | 12751 |
| 17231 | 13796 |
| 18721 | 14842 |
| 20211 |
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| 10x28x8 | 280 | 14891 |
| 18922 | 14072 |
| 17881 | 14043 |
| 18844 | 15205 |
| 20482 | 16367 |
| 22120 |
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| 12x12x8 | 144 | 10038 |
| 13021 | 9486 |
| 12305 | 8991 |
| 12553 | 9739 |
| 13655 | 10486 |
| 14756 |
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| 12x14x8 | 168 | 10956 |
| 14155 | 10353 |
| 13376 | 10235 |
| 14052 | 11055 |
| 15251 | 11875 |
| 16450 |
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| 12x16x8 | 192 | 11886 |
| 15284 | 11232 |
| 14443 | 11029 |
| 15082 | 11919 |
| 16375 | 12810 |
| 17667 |
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| 12x18x8 | 216 | 12775 |
| 16359 | 12072 |
| 15459 | 11807 |
| 16080 | 12767 |
| 17464 | 13726 |
| 18847 |
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| 12x20x8 | 240 | 13681 |
| 17440 | 12928 |
| 16481 | 12573 |
| 17052 | 13599 |
| 18524 | 14626 |
| 19995 |
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| 12x22x8 | 264 | 14549 |
| 18474 | 13749 |
| 17458 | 13299 |
| 17974 | 14392 |
| 19541 | 15485 |
| 21088 |
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| 14x14x8 | 196 | 11993 |
| 15423 | 11333 |
| 14575 | 11126 |
| 15216 | 12024 |
| 16521 | 12923 |
| 17826 |
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| 14x16x8 | 224 | 13013 |
| 16656 | 12297 |
| 15740 | 11995 |
| 16338 | 12971 |
| 17745 | 13946 |
| 19152 |
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| 14x20x8 | 280 | 15011 |
| 19042 | 14185 |
| 17795 | 13687 |
| 18487 | 14811 |
| 20088 | 15935 |
| 21688 |
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| 14x24x8 | 336 | 16969 |
| 21347 | 16036 |
| 21073 | 15330 |
| 20539 | 16598 |
| 22324 | 17866 |
| 24110 |
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| 16x16x8 | 256 | 14148 |
| 18019 | 13370 |
| 17028 | 12939 |
| 17550 | 13998 |
| 19067 | 15056 |
| 20583 |
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| 16x20x8 | 320 | 16349 |
| 20631 | 15450 |
| 19496 | 14777 |
| 19873 | 15996 |
| 21598 | 17215 |
| 23323 |
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| 16x24x8 | 374 | 18506 |
| 23157 | 17488 |
| 21883 | 16563 |
| 22093 | 17938 |
| 24017 | 19313 |
| 25941 |
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| 18x18x8 | 324 | 16476 |
| 20782 | 15570 |
| 19639 | 14864 |
| 19989 | 16090 |
| 21724 | 17317 |
| 23460 |
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| 18x20x8 | 360 | 18128 |
| 22644 | 17131 |
| 21398 | 16305 |
| 21678 | 17617 |
| 23523 | 18930 |
| 25369 |
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| 18x24x8 | 432 | 20484 |
| 25389 | 19357 |
| 23993 | 18260 |
| 24090 | 19739 |
| 26149 | 21219 |
| 28208 |
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| 20x20x8 | 400 | 19470 |
| 24145 | 18340 |
| 22817 | 17386 |
| 23019 | 18790 |
| 24982 | 20194 |
| 16945 |
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| 20x24x8 | 480 | 21988 |
| 27132 | 20779 |
| 25640 | 19453 |
| 25566 | 21036 |
| 27755 | 22619 |
| 29945 |
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| 20x28x8 | 560 | 24963 |
| 30480 | 23590 |
| 28804 | 21963 |
| 28514 | 23721 |
| 30922 | 25479 |
| 33330 |
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| 20x32x8 | 640 | 27480 |
| 33340 | 25969 |
| 31506 | 23954 |
| 30909 | 25884 |
| 33529 | 27813 |
| 36149 |
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| 20x36x8 | 720 | 29946 |
| 36127 | 28299 |
| 34140 | 25919 |
| 33251 | 28017 |
| 36077 | 30115 |
| 38903 |
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| 20x40x8 | 800 | 32420 |
| 38904 | 30637 |
| 36764 | 27888 |
| 35575 | 30153 |
| 38603 | 32518 |
| 41631 |
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| 24x40x8 | 960 | 38694 |
| 45735 | 36565 |
| 46878 | 34681 |
| 43023 | 37368 |
| 46538 | 39939 |
| 49937 |
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| 28x40x8 | 1120 | 43183 |
| 50733 | 40808 |
| 48970 | 38123 |
| 47062 | 41095 |
| 50921 | 43950 |
| 54664 |
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| 32x40x8 | 1280 | 48550 |
| 56318 | 45880 |
| 55056 | 42894 |
| 51900 | 46146 |
| 56580 | 49282 |
| 60656 |
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| 36x40x8 | 1440 | 54344 |
| 62804 | 51355 |
| 61626 | 46254 |
| 56259 | 49872 |
| 60781 | 53194 |
| 65186 |
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| 40x40x8 | 1600 | 58738 |
| 67611 | 55507 |
| 66608 | 49583 |
| 60073 | 53385 |
| 64916 | 57070 |
| 69642 |
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*Heavy usage is defined as two times the average air change. Average air changes determined by ASHRAE based on box size for 24 hour period.
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