Noodler 0 Report post Posted March 11, 2015 Hi all, which is a better material: Single or double hollow?I have requested for a few quotations for the aluminum sliding windows/grilles (just for service yard), as follows:Quote A < $700 - Double hollowQuote B Mid $700 - Single hollow (claims to be factory price)Qoote C > $800 - Double hollowIf double hollow requires more materials, why is single hollow more expensive than double hollow?Would appreciate if anyone can recommend their contractor if they are satisfied with their works.Thanks! Share this post Link to post Share on other sites
