What the Air Box Jr Intake Actually Keeps Out
Filtered intake is the half of sealed-room design most people skip. This unit stops 98% of insects, moulds, mildews, spores, pollen, dust and dander down to 0.3 microns, using a MERV 13 HEPA element. Maximum airflow is 250 CFM with 125 recommended at 1.0 inches water gauge. The housing runs 11.625 x 11.625 x 5.375 in at about 14.5 lbs on a 10 in flange, holding one 3 x 12 x 12 in cartridge behind a 12 x 12 x 2 in pre-filter. Stopping spores at the door costs far less than treating them on the leaf later. Maximum operating temperature is 176 F.
Sizing a Fan to a MERV 13 HEPA Filter
A merv 13 hepa filter adds static pressure by design, which is what catches you out if the fan was chosen for open ducting. The recommended figure is the one to build around, and running the unit near its ceiling costs both filtration and fan life. Mount it on the intake side and hang it from rope, chain, cable or ratchets. Keep the duct run short, so the fan is not fighting the filter and the bends at once. The pre-filter is the wear part and it should come out long before the main cartridge does. A side benefit growers notice is clean lenses and clean reflectors, because the dust that used to land on them never enters the room.
Key Features
- MERV 13 HEPA element: Stops 98% of spores, pollen, dust, dander and insects down to 0.3 microns.
- 250 CFM maximum: With 125 CFM recommended at 1.0 in water gauge, which is the figure to size a fan to.
- Ten inch flange: Standard duct diameter on a compact 11.625 in square housing.
- Replaceable cartridge and pre-filter: A 3 x 12 x 12 in element behind a 12 x 12 x 2 in pre-filter.
- Keeps lenses and reflectors clean: Dust that never enters the room never lands on the optics.
- Hangs from rope or chain: About 14.5 lbs, mounted with rope, chain, cable or ratchets.
Technical Specifications
| Specification | Value |
|---|---|
| Brand | Air Box |
| Model | Air Box Junior HEPA, intake |
| Part Number | 4543-H |
| Filter Type | MERV 13 HEPA |
| Filtration | 98% of airborne particles down to 0.3 microns |
| Maximum Airflow | 250 CFM |
| Recommended Airflow | 125 CFM |
| Pressure Drop | 1.0 in water gauge at recommended airflow |
| Flange | 10 in |
| Unit Size | 11.625 x 11.625 x 5.375 in |
| Weight | About 14.5 lbs |
| Cartridge Size | 3 x 12 x 12 in |
| Pre-Filter Size | 12 x 12 x 2 in |
| Mounting | Rope, chain, cable or ratchets |
| Max Operating Temperature | 176 F |
| Returns | 14 days from delivery if unused, with a 30% restocking fee and return shipping paid by the customer, per the Air Box manufacturer policy |