The difference between DOP air supply outlets and ordinary air supply outlets
DOP supply air outlet is a high-efficiency filtering supply air outlet equipped with DOP detection and liquid tank sealing. It is used in cleanrooms. Ordinary supply air outlets only serve the function of distributing air and do not have the functions of high-efficiency filtration and leak detection. They are used in ordinary air conditioning environments.
1. Core Definition
DOP supply air outlet (liquid tank type high-efficiency supply air outlet): A terminal device integrating static pressure box + liquid tank sealing high-efficiency filter + diffuser plate + DOP detection port. It can perform DOP/PAO leak detection on the filter on-site to ensure no leakage. It is commonly used in high-cleanliness environments such as pharmaceuticals, electronics, and healthcare.

Common supply air outlet: Composed only of frame + louvers / diffusers, with a maximum of primary / secondary filters, without high-efficiency filtration, without leak detection ports, and without strict sealing. It is used for comfort air conditioning in offices, shopping malls, residences, etc.

II. Key Differences (Item-by-item Comparison)
1. Filtration Capacity
DOP Supply Air Outlet: Built-in H14/U15 high-efficiency filter, with a filtration efficiency of ≥ 99.99% for 0.3μm particles, capable of intercepting bacteria and dust, achieving a cleanliness level of hundreds or thousands of grades.
Ordinary Supply Air Outlet: Equipped with primary (G1–G4) / secondary (F5–F9) filters or without filter, only capable of blocking large particles, with an efficiency of 20%–90%, unable to control microorganisms and dust.
2. Sealing and Leak Detection (The Most Critical Difference)
DOP Supply Air Outlet: Liquid槽 sealed (the filter frame is immersed in the sealing rubber slot)， zero leakage； equipped with DOP dust emission port + detection port， allowing on-site scanning for leak detection， in line with GMP / aseptic requirements.
Ordinary Supply Air Outlet： Ordinary rubber strips or without sealing， with frame leakage； without leak detection interface， unable to verify the sealing and filtration integrity.
3. Structure and Materials
DOP Supply Air Outlet： Welded with cold-rolled steel / 304 stainless steel， fully sealed treatment； includes static pressure box， valve， differential pressure detection， quick disassembly structure， with a box body that is thicker (approximately 500×500×250mm).
Ordinary Supply Air Outlet： Galvanized sheet / aluminum alloy / plastic， simple and lightweight structure； only panel + blades， without static pressure box， relying on the air duct for direct air supply.
4. Application Scenarios
DOP Supply Air Outlet： Pharmaceutical GMP workshops， operating rooms， electronic clean rooms， biological safety laboratories， etc.， within ISO 1–8 cleanliness zones.
Ordinary Supply Air Outlet： Office buildings， shopping malls， residences， restaurants， etc.， comfort air conditioning places without cleanliness requirements.
5. Cost and Maintenance
DOP Supply Air Outlet： High price (thousands of yuan)； filter replacement every 6–12 months， requiring professional leak detection and maintenance.
Ordinary Supply Air Outlet： Low price (several tens to several hundred yuan)； filter can be cleaned or simply replaced， maintenance is simple.