
What is a Primary Air Filter? Types, Efficiency Grades & B2B Sourcing Guide
In commercial HVAC, cleanroom design, and heavy industrial filtration, the primary efficiency air filter (commonly referred to as a primary air filter or
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Achieve superior air purity in high-heat environments with our 300°C Heat Resistant Pre Filter. Specifically designed for ovens with requirement on clean air, this G3 efficiency filter effectively captures particles while withstanding a maximum temperature of 300°C. Whether applied in drying ovens or industrial tunnels, its thin thickness and flat panel design allow for seamless integration into compact ventilation slots without sacrificing performance.
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Industrial Baking & Food Processing: Perfectly suited for industrial ovens used in food dehydration or chemical processing, ensuring clean air even at a maximum temperature of 300°C.
Automotive Paint Curing: Provides reliable G3 efficiency filtration in drying ovens and heat-treatment tunnels to prevent dust from ruining high-gloss vehicle finishes.
Electronics & Semiconductor Drying: Ideal for industrial tunnels where sensitive electronic components require moisture removal in a clean-air environment.
Metal & Glass Tempering: Serves as a heavy-duty high-temp panel filter for ovens used in metal heat treatment or glass annealing, maintaining performance in extreme thermal conditions.
Compact Lab Equipment: Thanks to its thin thickness (21mm/46mm), it seamlessly integrates into laboratory incubators and sterilization cabinets with space-constrained ventilation slots.

| Feature | Chuqi 300°C Heat Resistant Filter | Standard High-Temp Filters | The Chuqi Advantage |
| Thermal Limit | Stable up to 300°C. | Often limited to 150°C – 200°C. | Safety: No risk of media melting or smoke during high-heat cycles. |
| Energy Efficiency | Ultra-low resistance (40Pa). | Typically 80Pa or higher. | Cost Saving: Reduces fan load and lowers system energy draw. |
| Structural Protection | Dual Aluminum net face guards. | Single-sided or no protective mesh. | Durability: Prevents media migration and structural sagging under heat. |
| Compactness | Slim 21mm/46mm profile. | Usually bulky (over 50mm). | Space Saving: Allows for more compact industrial oven designs. |
| Media Quality | Premium fiberglass/synthetic media. | Low-grade domestic cotton. | Purity: Ensures cleaner air for processes with high cleanliness requirements. |

| External dimensions (mm) | Rated air volume (m3/h) | initial resistance (Pa) | Efficiency (Level) (class) | Filter media model
| highest temperature
|
| 500 × 250 × 2 1 mm | 1500m³ / h | 40 Pa | G3 | Fiberglass wool Imported synthetic fiber cotton
| 300 ℃ |
| 500 × 500 × 2 1 mm | 3000m3/h | ||||
| 595×595×21mm | 4200m3/h |
Chuqi specializes in high-performance air purification for extreme environments, offering the 300°C Heat Resistant Pre Filter designed to maintain integrity under intense thermal loads. By utilizing premium Fiberglass High Temp Filter media or imported synthetic fibers within a durable Aluminum or Galvanized steel frame, we ensure zero deformation and no odor release during operation. As a dedicated Industrial Oven Air Filter, our solution provides a reliable clean-air guarantee for Hot air tunnels and various heat treatment processes.

Q: Can this filter maintain air purity in high-heat industrial ovens?
Absolutely. It is specifically designed for ovens with requirements on clean air, offering G3 efficiency to effectively capture particles while withstanding a maximum temperature of 300°C.
Q: Will the filter fit into a compact or space-constrained drying tunnel?
Yes. Its thin thickness and flat panel design (available in 21mm and 46mm) allow for seamless integration into even the most compact ventilation slots without sacrificing thermal performance.
Q: How does the low resistance design benefit my production line?
The filter maintains an incredibly low resistance of 40Pa. This ensures your high-temp ventilation system runs at peak energy efficiency, reducing operational noise and long-term electricity costs.
Q: Is there any risk of the filter media shedding during high-velocity heat cycles?
No. The filter features a robust aluminum net face guard on both sides. This protection prevents media migration and ensures structural stability during intense heating in drying ovens or tunnels.
Q: What materials are used for the frame to prevent off-gassing at 300°C?
We use durable Aluminum or Galvanized steel frames. These materials are chosen for their thermal stability and durability, ensuring no harmful gasses are released into your clean heating environment.

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