Dear Experts,Hi,I am trying to find the location of type 667c, I have found the type 667, Type 667b, and type 667d. But despite so much search, cannot find the type 667.Type 667 is air to air heat recovery device.Your help in this regard shall be highly appreciated.Best Regards,Yours Sincerely,Muhammad Tauseef NasirPhD Student,Department of Building Service Engineering,Hong Kong Polytechnic University.
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