4. Rack installation connecter
3. Bearing prevent: coopergear rack for automobile sleeve or nylon Sleeve
2. Rack and pinion: curved or straight rack, nylon or cooper sleeve for the pinion
1. Gear motor : 550W/750W
Choose the right location for your cool frame. In order to increase warmth and sunlight as well as your cold frame, choose an optimal area to put your structure. Choose a south-facing spot that provides lots of sunlight. Avoid spots near trees or other structures where snow or leaves can pile on your cold framework. This may result in harm to your structure or sunlight blockage.
Allow ventilation on hotter days. An excessive amount of warmth isn’t always a good thing – and that’s the benefit of a cold body greenhouse. Since outdoor sunshine and temperature impact a cold frame’s internal temperature, easily adjust your cold body during unseasonable temperature waves. Of these occasions, open up your structure and invite sufficient airflow to provide plants preferred warmth without suffocating them.
Use your cold body for growing within your means. As stated previously, cool frames are excellent for extending the developing season of cool-period vegetables in the springtime and winter. When hardening off tender vegetation and seedlings, chilly frames also allow for a less strenuous transition for vegetation from inside to outdoors. Stick to choices that survive inside your location’s current environment range, not completely out-of-season plant types. The internal temperatures are just somewhat warmer and more managed than the outdoors. So, plants should manage the highs and the lows of your region fairly well while safeguarded in your cold frame.
The rack and pinion drive system is for the mult-span agriculture venlo greenhouse ventilation system, it can be used for the medial side window openingh or the roof widoiw opening system. The rack and pinion system move smoothly and dependable. and will be control automaticly.
Extend the growing season for cool-period crops. Because cool frames provide a slightly warmer and more managed environment than external temps, these units help gardeners start plants without worry of frost or frozen floor. Plants won’t be affected by unseasonably cold or warm weather we often encounter during springtime and fall. Chilly frames work great for cool-season plants because they can withstand the low evening temperatures.
Overwinter dormant vegetation. While a cold frame greenhouse won’t allow tender plants to continue growing through winter, these structures can protect them during dormancy. When overwintering vegetation, minimize sunlight and keep maintaining adequate soil dampness. This ensures plants won’t attempt to grow but don’t completely dry out either.
Harden off delicate plants and seedlings. Cold frame greenhouses help plant life make the changeover from indoor plant life to outdoor vegetation. Whether you began seedlings in your house or a greenhouse, plant life must gradually adjust to the change in temperature, sunlight, dampness, and exposure outdoors. With a cold body, plants are controllably subjected to these changes, while still staying sufficiently secured. Once plants change to the climate change 
in your cold body, then transplant them to your garden.
Cold frame greenhouses are relatively simple to use for just about any or all the reasons listed above. However, keep these couple of tips in mind to be able to maximize the benefits of your structure.