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 cold frame. In order to maximize warmth and sunlight and your cold frame, pick an optimal area to place your structure. Select a south-facing spot that provides lots of sunlight. Avoid areas near trees or other structures where snow or leaves can pile on your cold body. This may result in harm to your structure or sunlight blockage.
Allow ventilation upon hotter days. An excessive amount of warmth isn’t always a good thing – and that’s the advantage of a cold body greenhouse. Since outdoor sunlight and temperature influence a cold frame’s inner temperature, easily change your cold framework during unseasonable warmth waves. Of these occasions, open your structure and allow sufficient airflow to give plants preferred warmth without suffocating them.
Use your cold framework for growing within your means. As mentioned previously, chilly frames are great for extending the growing season of cool-period vegetables in the spring and wintertime. When hardening off tender vegetation and seedlings, cool frames also allow for a less strenuous transition for vegetation from inside to outdoors. Stick to choices that survive inside your location’s current weather range, not totally out-of-season plant varieties. The internal temperatures are only somewhat warmer and more managed than the outdoors. So, vegetation should handle the highs and the lows of your region 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 window openingh or the roof widoiw opening system. The rack and pinion system move smoothly and reliable. and will be gear rack for automobile control automaticly.
Extend the season for cool-period crops. Because cool frames provide a slightly warmer and more managed environment than external temperature ranges, these units help gardeners start plants without worry of frost or frozen ground. Plants won’t be affected by unseasonably cold or warm weather we often experience during spring and fall. Cold frames work great for cool-season plants as they can withstand the low evening temperatures.
Overwinter dormant plants. While a cold framework greenhouse won’t enable tender plants to continue growing through winter, these structures can protect them during dormancy. When overwintering plant life, minimize sunlight and keep maintaining adequate soil dampness. 
This ensures plant life won’t attempt to develop but don’t completely dry either.
Harden off delicate vegetation and seedlings. Cold framework greenhouses help vegetation make the transition from indoor vegetation to outdoor vegetation. Whether you began seedlings in your house or a greenhouse, plant life must gradually modify to the change in temperature, sunlight, moisture, and exposure outdoors. With a cold body, plants are controllably subjected to these adjustments, while still staying sufficiently shielded. Once plants modify to the climate alter in your cold frame, after that transplant them to your backyard.
Cold framework greenhouses are relatively simple to use for just about any or all of the reasons listed above. However, keep these couple of tips in mind in order to maximize the advantages of your structure.