Dryerbox 350 vs. 425: Which Recessed Dryer Vent Box Do I Need?
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Choosing between the Dryerbox 350 and Dryerbox 425 is primarily a matter of wall depth and exhaust direction. Both models provide a recessed connection area behind the dryer, helping protect the transition duct from being crushed when the dryer is pushed toward the wall.
For most installations, the choice is simple:
2×4 wall + upward exhaust → Dryerbox 350
2×6 wall + upward exhaust → Dryerbox 425
If the dryer exhaust needs to travel down through the floor, consider the Dryerbox 4D for a 2×6 wall rather than the 350 or 425.
Dryerbox 350: Designed for 2×4 Walls
The Dryerbox 350 is designed specifically for installations with 2×4 wall framing and upward exhaust.
Its shallower profile allows the box and exhaust connection to work within the limited depth of a typical 2×4 stud cavity. The top duct opening is ovalized to accommodate the restricted wall depth while still connecting to standard 4-inch dryer exhaust duct.
The Dryerbox 350 is a strong choice for:
- 2×4 wall construction
- Upward-running dryer exhaust
- New construction and remodeling
- Laundry rooms where maximizing usable space behind the dryer is important
Shop the Dryerbox 350: Click here for the DB350
Dryerbox 425: Designed for 2×6 Walls
The Dryerbox 425 is designed for 2×6 wall construction with upward exhaust.
The additional wall depth allows the 425 to provide more room behind the connection. The manufacturer identifies the 425 as its most popular model, and it works particularly well where the dryer duct runs upward through the wall toward a roof or other approved termination.
The Dryerbox 425 is a strong choice for:
- 2×6 wall construction
- Upward-running dryer exhaust
- Standard, pedestal and many stacked dryer installations
- Residential and multifamily construction
Shop the Dryerbox 425: Click here for the DB425
Dryerbox 350 vs. 425 at a Glance
| Feature | Dryerbox 350 | Dryerbox 425 |
|---|---|---|
| Recommended wall | 2×4 | 2×6 |
| Exhaust direction | Upward | Upward |
| Overall height | 21" | 21" |
| Overall width | 12½" | 12½" |
| Approx. depth behind flange | 3½" | 4¼" |
| Construction | 22-gauge aluminized steel | 22-gauge aluminized steel |
The easiest way to remember the difference is:
350 = 2×4 wall
425 = 2×6 wall
What If My Dryer Vent Goes Down Through the Floor?
If the exhaust duct needs to travel downward rather than upward, don't select a box based solely on wall depth.
For a 2×6 wall with downward exhaust, the Dryerbox 4D is specifically designed for this configuration. Its bottom duct connection allows the dryer exhaust to transition downward through the wall cavity and floor.
Shop the Dryerbox 4D: Click here for 4D
For downward exhaust in a 2×4 wall, the comparable purpose-built model is the Dryerbox 3D. This is not a stocked item so if needed, please let us know.
Why Use a Recessed Dryer Vent Box?
Without a recessed connection, the dryer transition duct occupies space between the appliance and wall. Pushing the dryer too far back can crush or sharply bend that duct.
A properly selected recessed Dryerbox provides space for the transition duct behind the dryer, helping reduce restriction and allowing the appliance to sit closer to the wall.
Still Not Sure Which Dryerbox You Need?
Start with two questions:
1. Is your wall framed with 2×4 or 2×6 studs?
2. Does the dryer exhaust travel upward or downward from the Dryerbox?
For upward exhaust, choose the 350 for a 2×4 wall or the 425 for a 2×6 wall. For downward exhaust through a 2×6 wall, choose the 4D.
Browse all available models, accessories and related dryer-vent products in our Dryerbox Collection.