4. Rack installation connecter
3. gear rack for Greenhouse Bearing block: 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 chilly frame. In order to increase warmth and sunlight and your cold frame, choose an optimal location to put your structure. Choose a south-facing spot that offers lots of sunlight. Avoid areas near trees or additional structures where snow or leaves can pile on your cold frame. This could result in damage to your structure or sunlight blockage.
Allow ventilation upon hotter days. Too much warmth is not always a good thing – and that’s the advantage of a cold body greenhouse. Since outdoor sunlight and temperature impact a cold frame’s internal temperature, easily adapt your cold framework during unseasonable heat waves. Of these occasions, open up your structure and allow sufficient airflow to give plants desired warmth without suffocating them.
Use your cold frame for growing within your means. As mentioned previously, cool frames are great for extending the growing season of cool-period vegetables in the springtime and winter season. When hardening off tender vegetation and seedlings, frosty frames also allow for a less strenuous transition for vegetation from inside to outside. Stick to options that survive within your location’s current climate range, not completely out-of-season plant varieties. The internal 
temperatures are only slightly warmer and more managed than the outdoors. So, vegetation should deal with the highs and the lows of your area fairly well while secured 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 program move smoothly and dependable. and can be control automaticly.
Extend the season for cool-time of year crops. Because cool frames provide a somewhat warmer and more controlled environment than external temperature ranges, these devices help gardeners start plant life without worry of frost or frozen floor. Plants won’t be suffering from unseasonably cold or warm weather we often experience during springtime and fall. Cool frames work great for cool-season plants as they can withstand the lower evening temperatures.
Overwinter dormant vegetation. While a cold frame greenhouse won’t allow tender plants to continue growing through wintertime, these structures can protect them during dormancy. When overwintering plants, minimize sunlight and maintain adequate soil moisture. This ensures vegetation won’t attempt to grow but don’t completely dry out either.
Harden off delicate plant life and seedlings. Cold framework greenhouses help plant life make the changeover from indoor vegetation to outdoor plants. Whether you began seedlings in your house or a greenhouse, vegetation must gradually modify to the alter in temperature, sunlight, moisture, and exposure outdoors. With a cold frame, plants are controllably subjected to these changes, while still keeping sufficiently protected. Once plants change to the climate change in your cold framework, then transplant them to your garden.
Cold body greenhouses are relatively simple to use for any or all of the reasons in the above list. However, keep these couple of tips in mind in order to maximize the benefits of your structure.