4. Rack installation connecter
3. Bearing block: 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 best location for your cold frame. To be able to increase warmth and sunlight as well as your cold frame, choose an optimal area to place your structure. Choose a south-facing spot that offers plenty of sunlight. Avoid spots near trees or additional structures where snow or leaves can put on your cold body. This could result in damage to your structure or sunlight blockage.
Allow ventilation upon hotter days. An excessive amount of warmth is not always a good thing – and that’s the benefit of a cold frame greenhouse. Since outdoor sunshine and temperature influence a cold frame’s inner temperature, easily adjust your cold frame during unseasonable heat waves. During these occasions, open your structure and invite sufficient airflow to provide plants preferred warmth without suffocating them.
Use your cold framework for growing inside your means. As stated previously, frosty frames are great for extending the growing season of cool-period vegetables in the spring and wintertime. When hardening off tender vegetation and seedlings, cold frames also allow for a less strenuous gear rack for automobile transition for plants from inside to outdoors. Stick to choices that survive within your location’s current weather range, not completely out-of-season plant varieties. The internal temperatures are just somewhat warmer and more controlled compared to the outdoors. So, plant life should handle the highs and the lows of your area fairly well while protected in your frosty frame.
The rack and pinion drive system is for the mult-span agriculture venlo greenhouse ventilation system, it can be utilized for the side window openingh or the roof widoiw opening system. The rack and pinion system move smoothly and reliable. and will be control automaticly.
Extend the season for cool-period crops. Because chilly frames provide a slightly warmer and more managed environment than external temperatures, 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 ideal for cool-season plants because they can withstand the low evening temperatures.
Overwinter dormant vegetation. While a cold body greenhouse won’t allow tender plants to keep growing through wintertime, these structures can protect them during dormancy. When overwintering plant life, minimize sunlight and keep maintaining adequate soil moisture. This ensures vegetation won’t attempt to grow but don’t completely dry out either.
Harden off delicate vegetation and seedlings. Cold frame greenhouses help plant life make the transition from indoor plant life to outdoor plant life. Whether you began seedlings in your home or a greenhouse, vegetation must gradually change 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 shielded. Once plants adjust to the climate change in your cold framework, after that transplant them to your garden.
Cold framework greenhouses are relatively simple to use for just about 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.