Owner's Manual

CRLCULRTING ENCLOSURE VOLUME
It is difficult to give exact box dimensions that are universal for all cars and
trucks. It is for this reason that you must be able to calculate the space in
which you have available in order to achieve the proper air volume required.
It is recommended to build your enclosure from
3/4" thick MOF (medium
density fiberboard). Make sure the enclosure is sealed air tight.
Calculating External
Volume
1.) To calculate box volume. measure the outside Width x Height x Depth of the
enclosure.
Example 12" x 14" x 9" = 1512".
2.) Next you must convert cubic inches into cubic feet. To do this. you must
divide the
cubic inch total by 1728".
Example 1512 +1728 = .875 Cubic feet.
Calculating Internal
Volume
1.) To calculate the internal (net) volume of the above box you must first
multiply the thickness of the wood you are using by Two (2).
Example 3/4" x 2 = 1.5".
2.)
Next subtract 1.5 from each of the outside measurements of the box.
Width
12-1.5=10.5
Height
14 -1.5 = 12.5
Depth
9 -1.5 = 7.5
3.) Multiply the new totals (H x Wx D)
Example: 10.5 x 12.5 x 7.5 = 984.375
4.) Next you must convert cubic inches into cubic feet. To do this. you must
divide the
cubic inch total by 1728"
Example 984.375 : 1728 = .5696 Cubic feet.
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