<https://www.hortitechdirect.com/products/aluminum-exhaust-shutter#json-ld-for-seo>
<http://schema.org/description>
"J&amp;D Manufacturing's Aluminum Power Intake Shutters are constructed with a heavy-duty aluminum extrusion frame and strong welded corners, all at an affordable cost. Our aluminum greenhouse shutters are by far the best-valued shutter available on the market today. Power intake shutters are designed to bring fresh air into your greenhouse and may also be used for free-air exhaust. Options are available for multiple sizes and with or without cord.\nFeatures\n\nAvailable in 48”, 54”, 60”, and other options\nHigh-efficiency shutter with tie bar to eliminate shutter flapping\nNylon bearings and solid shafts for smooth performance\nInterlocking louvers for maximum weather seal\n"
<https://www.hortitechdirect.com/products/aluminum-exhaust-shutter>