Our Guarantee
Construction Book Express and our suppliers are dedicated to providing quality products to our customers. We stand behind our commitment to quality with a satisfaction guarantee on every purchase*. If, for any reason, a customer is not satisfied with a product, they may return it within 30 days of the date purchased for a refund of the purchase price of the product(s). Returned merchandise must be in its original box, in new condition and include all instructions, and the invoice or packing slip.
*Exceptions: Videos/DVDs, audiotapes and software products (once opened), forms, documents, reports and downloads are not returnable.
SMACNA - Duct System Calculator - Metric