Umnyango we-fire rate louvers usebenzisa amaphrofayili ensimbi, ukukhetha okuqinile kwezinto zokwakha, kanye nekhwalithi eqinisekisiwe. I-Fire rate louvers door inezincazelo ezihlukahlukene kanye nobuciko obuhlakaniphile. Singabakhiqizi abaneminyaka eminingi yesipiliyoni sokukhiqiza kanye nesevisi esondelene kakhulu.

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