4. Rack installation connecter
3. Bearing prevent: coopersleeve 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 maximize warmth and sunlight as well as your cold frame, choose an optimal location to put your structure. Select a south-facing spot that offers plenty of sunlight. Avoid areas near trees or other structures where snow or leaves can put on your cold framework. This could result in damage to your structure or sunlight blockage.
Allow ventilation upon hotter days. An excessive amount of warmth isn’t always a very important thing – and that’s the advantage of a cold frame greenhouse. Since outdoor sunshine and temperature influence a cold frame’s inner temperature, easily adjust your cold frame during unseasonable temperature waves. During these occasions, open up your structure and allow sufficient airflow to give plants preferred warmth without suffocating them.
Use your cold body for growing within your means. As stated previously, chilly frames are great for extending the developing gear rack for automobile season of cool-period vegetables in the spring and winter season. When hardening off tender plants and seedlings, chilly frames also enable a less strenuous transition for vegetation from inside to outdoors. Stick to options that survive within your location’s current climate range, not completely out-of-season plant types. The internal temperatures are just slightly warmer and more managed compared to the outdoors. So, plant life should handle the highs and the lows of your region fairly well while guarded in your cold frame.
The rack and pinion drive system is for the mult-span agriculture venlo greenhouse ventilation system, it can be utilized for the medial side window openingh or the roof widoiw opening system. The rack and pinion program move smoothly and reliable. and can be control automaticly.
Extend the season for cool-season crops. Because cold frames provide a somewhat warmer and more controlled environment than external temperatures, these devices help gardeners start vegetation without worry of frost or frozen ground. Plants won’t be affected by unseasonably cold or warm weather we often encounter during spring and fall. 
Cool frames work ideal for cool-season plants as they can withstand the low evening temperatures.
Overwinter dormant plants. While a cold body greenhouse won’t allow tender plants to keep growing through winter, these structures can protect them during dormancy. When overwintering plants, minimize sunlight and maintain adequate soil dampness. This ensures plants won’t attempt to develop but don’t completely dry out either.
Harden off delicate vegetation and seedlings. Cold body greenhouses help vegetation make the changeover from indoor plants 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 outside. With a cold framework, plants are controllably exposed to these adjustments, while still staying sufficiently secured. Once plants change to the climate change in your cold framework, then transplant them to your garden.
Cold frame greenhouses are relatively simple to use for any or all the reasons listed above. However, keep these few tips in mind to be able to maximize the benefits of your structure.