this is linna, hvac controller maker in china.
everybody who has problems about hvac system can ask me here. please don't hesitated.
to know more about me, can browse my website at http://www.hvac-control.net
A forum community dedicated to professional HVAC contractors. Come join the discussion about The industry, safety, ducting, finishing, tools, machinery, projects, styles, scales, reviews, accessories, classifieds, and more!