Buy Guard Dehumidifiers for Commercial Cultivation

Preair Guard series is a line of dehumidifiers specifically engineered for indoor cultivation, such as grow rooms and tents. These units are designed to manage the heavy moisture loads produced by dense plant canopies and high-intensity lighting, helping growers optimize yields and prevent mold or disease.

Growth Stages of Cannabis and Its Corresponding Environmental Requirements

Cannabis plants require carefully controlled environmental conditions to achieve healthy growth, high yields, and optimal cannabinoid and terpene production. Key factors include temperature, humidity, lighting, air circulation, and CO₂ levels. Different growth stages require different temperature ranges. Humidity management is critical for preventing mold and maximizing plant performance. By the way, many commercial cultivators use VPD rather than humidity alone to optimize transpiration.

Commercial cultivation facilities often install dedicated dehumidification systems to:

Maintain target RH levels

Prevent condensation

Reduce mold risks

Improve crop consistency

Support year-round production

Environment	1. Seedling Stage	2. Vegetative Stage	3. Flowering Stage	4. Drying Stage
Light-on Temperature:	68-77°F (20-25°C)	70-85°F (21-29°C)	65-80°F (18-27°C)	60-70°F (15-21°C)
Light-off Temperature:	63-72°F (17-22°C)	65-75°F (18-24°C)	65-75°F (18-24°C)	60-70°F (15-21°C)
Ideal Relative Humidity:	65-70％RH	45-65％RH	45-55％RH	55-65％RH (7-14 days)

Environmental Inflections for Cannabis Growth

Common Features of the Guard Series

Cultivation-Specific Design:

All models are optimized for the entire growth cycle, including low-temperature operation (down to 5°C or 13°C, depending on the model) without constantly entering defrost mode.

Smart & Remote Control:

They feature WiFi connectivity, dedicated APP control, and Modbus communication, allowing for seamless integration into third-party environmental control systems.

High Efficiency:

The series is designed for low energy consumption. Although there is a certain gap between our dehumidifier and the top brand Quest, our dehumidifier has higher efficiency among machines of the same price range.

Durable Build:

Units use sheet metal housings and thickened copper tubing to ensure long-term reliability in harsh commercial environments.

Installation Flexibility:

Most models are designed for ceiling mounting or overhead placement to save valuable floor space, utilizing direct gravity drainage, meeting California Title 24 requirements.

Functionality Comparison Between Guard and Zeta Dehumidifiers

Functions	Guard Series	Zeta Series
External humidity sensor	Yes	No
Wire control	Yes	No
RS485 control	Yes	No
Easy to repair	Yes	No
Suitable for low-temperature conditions	Yes	No
Easy to disassemble and assemble	Yes	No
Adjustable defrosting time	Yes	No
Stable dehumidification curve	Yes	No

Specifications of Guard Series Dehumidifiers

Model	Guard70	Guard120	Guard240
Power Supply	220-240V / 50Hz	380V / 50Hz	380V/3Ph/50Hz
Rated Current	5.2A	4.5A	9.6A
Rated Power	1200W	1200W	4800W
Dehumidification Capacity (30 ℃/80% RH)	145 L/Day	240 L/Day	480 L/Day
Dehumidification Capacity (26.7 ℃/60% RH)	70 L/Day	120 L/Day	240 L/Day
Dehumidification Capacity (15 °C/60% RH)	45 L/Day	70 L/Day	/
Operational Temperature Range	5°C-38°C	5°C-38°C	5°C-38°C
Operational Humidity Range	10% - 90% RH	30% - 90% RH	10% - 90% RH
Refrigerant	R410A	R410A	R410A
Drainage Type	3/4NPT Direct Drain	3/4 NPT Direct Drain	3/4 NPT Direct Drain
Unit Body	Sheet Metal Housing	Sheet Metal Housing	Sheet Metal Housing
Display Board	LCD Panel	LCD Panel	LCD Panel
APP	Yes	Yes	Yes
WiFi	Yes	Yes	Yes
Timing	Yes	Yes	Yes
Screen Lock	Yes	Yes	Yes
Filter Screen	Nylon (Standard); MERV8 (Optional)	Nylon (Standard); MERV8 (Optional)	Nylon (Standard); MERV8 (Optional)
Net Weight	63.5 kg	120 kg	214 kg
Gross Weight	82.5 kg	150 kg	255 kg
Body Dimensions	872610442 mm	1040760720mm	12871040740mm
Package Dimensions	960675590 mm	1160820890mm	13501150915mm

Actual Usage Comparison Between Guard and Zeta Dehumidifiers

Pain point 1: Unstable humidity levels in the grow room can affect THC content and cannabis flowering density. Growers do not pursue "dehumidification", but for precise control of VPD (vapor pressure difference). For example, the ideal humidity during the flowering period is 40% -50%, and the ideal humidity during the vegetative period is 55% -70%.

Advantages of GUARD dehumidifiers:

Accurate humidity control, with humidity fluctuations controlled within ± 3%

Stable humidity, minimal fluctuations, keep a more stable environment

Pain point 2: Display VPD, which can automatically adjust humidity by adjusting VPD, creating a suitable and controllable growth environment, not just simple dehumidification.

Advantages of GUARD dehumidifiers:

Stabilize VPD, increase yield at various stages, and density of cannabis flowering

Pain point 3: Growers hope to achieve integrated control that is compatible with common third-party controllers on the market.

Advantages of GUARD dehumidifiers:

Equipped with a terminal block, compatible with Trolmaster

Comes with an app function, dehumidifiers can be divided into different groups, stages, and rooms for control

Pain point 4: Requires a reliable and easy-to-maintain machine that can operate stably 24/7 and achieve rapid cleaning of the filter.

Advantages of GUARD dehumidifiers:

Optimization of the refrigeration system for easy maintenance and replenishment

Has strong self-protection ability and is not easily damaged.

Adjustable defrosting conditions and smoother operation

Auto-restart function