4. Rack installation connecter
3. Bearing prevent: coopersleeve or nylon Sleeve
2. Rack and pinion: curved or directly rack, nylon or cooper sleeve for the pinion
1. Gear motor : 550W/750W
Choose the right location for your cool frame. To be able to increase warmth and sunlight as well as your cold frame, pick an optimal area to place your structure. Choose a south-facing spot that provides lots of sunlight. Avoid places near trees or other 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 isn’t always a very important thing – and that’s the advantage of a cold frame greenhouse. Since outdoor sunlight and temperature impact a cold frame’s internal temperature, easily modify your cold body during unseasonable high temperature waves. During these occasions, open your structure and allow sufficient airflow to provide plants desired warmth without suffocating them.
Use your cold frame for growing within your means. As stated previously, cold frames are great for extending the growing season of cool-period vegetables in the spring and wintertime. When hardening off tender plant life and seedlings, chilly frames also enable an easier transition for plant life from inside to outdoors. Stick to choices that survive within your location’s current climate range, not completely out-of-season plant types. The internal temperatures are only somewhat warmer and more controlled compared to the outdoors. So, vegetation should manage the highs and the lows of your area fairly well while protected in your chilly 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 gear rack for Greenhouse window openingh or the roof widoiw opening system. The rack and pinion program move smoothly and reliable. and can be control automaticly.
Extend the growing season for cool-time of year crops. Because frosty frames provide a slightly warmer and more controlled environment than external temperature ranges, these products help gardeners start vegetation without worry of frost or frozen surface. Plants won’t be suffering from unseasonably cold or warm weather we often encounter during spring and fall. Cool frames work ideal for cool-season plants because they can withstand the low evening temperatures.
Overwinter dormant plants. While a cold frame 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 vegetation won’t attempt to grow but don’t completely dry either.
Harden off delicate plants and seedlings. Cold frame greenhouses help plant life make the transition from indoor vegetation to outdoor plant life. Whether you started seedlings in your house or a greenhouse, plant life must gradually modify to the modify in temperature, sunlight, dampness, and exposure outdoors. With a cold frame, plants are controllably subjected to these adjustments, while still staying sufficiently safeguarded. Once plants adapt to the climate modify in your 
cold frame, then transplant them to your backyard.
Cold framework greenhouses are not at all hard to use for any or all the reasons in the above list. However, keep these couple of tips in mind to be able to maximize the advantages of your structure.