These are cast sections that very in length from 5' to  25'6" and along with additional extension sections you cut to length and add the transition end sections. You get 2 lengths  25' 6 " long ( 3 -  8'6" segments ) and 4 transition end sections. These pieces were designed to
fit the standard roof  for the Wide body cross section

Extensions may be added to the increase the length. Choose
the size you want from the drop down menu for DM 330A.

DM 330 HW AC duct work sections Starter set

$25.00Price

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     *  Item DM 602  the 36 x 6 x 6   Carry cases will be discontinued when sold out.

    this is being done as  36"  long cases are just to heavy with the weight of the model

    to be carried round and  into most layout rooms .

    So we have gone to the  24 x 6 x 6  --    24 x 9 x 6  --   30 x 9 x 6  ---  30 x 6 x 6

     

    This has been the choice of  many customers, who have purchase