Automatic greenhouse vent opener

AUTO VENT OPENER NO ELECTRICITY OR MANUAL OPERATION REQUIRED!  Fully automatic heat activated greenhouse ventilation Completely adjustable to operate and open between 15-25C Allows greenhouse window to open up to 450mm Suitable for windows up to 7kg Simple installation using the brackets/screws provided All inclusive 12 month warranty Heat activated Open window fully to 450mm
No batteries or electricity required,environmentally friendly.
when bad weather coming,This model can let you  close the window much faster than other models .   With  window openers, you can be sure of an even temperature in your greenhouse day and night...!
Product Description   AUTOMATIC VENT OPENER 1. Arm: Iron with chrome on surface 2. Cylinder: Aluminum ( 200mm ) 3. Inner packing: Box Size(LxWxH): 8.5x5x28.5cm Color: Black or Grey     Contact us Beijing Aigeng Agri-Facilities Co.ltd. (Subsidiary of BEIJING SANLICOM TECHNOLOGY CO. LTD.) 2/F, ShouGang Gucheng Culture House, Gucheng Alley, Shijingshan, Beijing 100043, China Tel.:00861068887642/47 Web: www.sanlicom.com