Most people fail to realize this, but when installing HVAC or refrigeration systems, small details like the wall inlet can make a big difference. A proper slim duct wall inlet not only improves the look of your setup but also makes sure your linesets are sealed, protected, and secure.
Inaba Denko America’s SW and SWA wall inlets are two of the most popular options for connecting Slimduct™ systems to building walls. Both serve the same purpose, covering and protecting refrigerant and drain lines as they enter or exit the wall, but each has unique benefits depending on how you use them.
Let’s break down how they work, when to use them, and what makes them different.
What Does a Wall Inlet Do?
A wall inlet provides a clean and sealed transition point where your linesets pass through the building wall. It connects the outdoor section of your Slimduct™ lineset cover to the indoor piping or wall sleeve.
Without one, your lineset opening would be exposed to weather, insects, and debris, which is something no installer or property owner wants. It’s a small but essential piece that contributes to the system’s long-term durability.
Meet the Slimduct™ SW and SWA Wall Inlets
Both the SW and SWA Slimduct™ wall inlets from Inaba Denko America are built for high performance and easy installation. While they look similar, there are key differences that affect which one you should choose.
1. The SW Wall Inlet: Two-Piece Design for a Perfect Seal
The SW wall inlet comes in two parts: a base and a cover. This design allows for a tight seal when working with wall sleeves. The base slides into the wall sleeve and locks the lineset securely in place. Once the cover is snapped on, you get a solid and professional finish.
The back of the base has an outline that fits into the sleeve, providing an airtight connection that helps prevent air leaks, moisture intrusion, and pest entry. When installing a wall power inlet or running refrigerant lines through a pre-drilled hole with a sleeve, this is the model you’ll want.
Installation tips for SW:
- Level and anchor the base before running the lineset.
- Apply a solid bead of caulking around the edge for a clean, weather-tight seal.
- Pop the cover on and secure it with the provided screws.
- Perfect for vertical applications where you want the cover to stay put over time.
Because it’s designed to “lock in,” the SW Slimduct™ wall inlet helps prevent downward slipping on vertical runs, which is a common problem with basic one-piece inlets.
2. The SWA Wall Inlet: Simple and Fast One-Piece Design
The SWA wall inlet is a single-piece version that offers quick installation and a clean look. You simply position it over your drilled hole, insert your linesets, anchor it with three screws, and apply caulking. That’s it.
It doesn’t use a base plate or nipple, which means you have more flexibility in positioning. This is helpful when you have multiple exit points on the same wall and want them to line up perfectly for aesthetic reasons.
The SWA Slimduct™ wall inlet is ideal for installers looking for speed and simplicity. Since it doesn’t rely on a wall sleeve connection, you can use it directly over wall penetrations in residential or light commercial projects.
When to use SWA:
- For direct wall penetrations without sleeves.
- In horizontal runs or single-outlet setups.
- When you want fast installation with minimal parts.
SW vs. SWA: Which One Should You Use?
| Feature | SW Wall Inlet | SWA Wall Inlet |
|---|---|---|
| Design | Two-piece (base + cover) | One-piece (cover only) |
| Best For | Wall sleeve connections, vertical runs | Direct wall penetrations, quick installs |
| Seal | Airtight with caulking groove and stopper | Caulked edge only |
| Flexibility | Fixed alignment with base | Adjustable positioning |
| Installation | Slightly longer setup | Fast and simple |
| Look | Clean, sealed finish | Streamlined and flexible |
If you’re dealing with vertical Slimduct™ runs, the SW is your safest choice. It keeps the cover from sliding over time, even in vibration-heavy or weather-exposed environments. If you’re working on a simple horizontal lineset, the SWA wall inlet saves time without sacrificing appearance.
Installation Best Practices for Slimduct™ Wall Inlets
No matter which inlet you choose, installation quality determines long-term performance. Follow these practical tips to get the most from your setup:
- Always use caulking. Apply a continuous bead where the cover meets the wall. This prevents moisture and pests from sneaking in.
- Level the inlet before securing. Even a slight tilt can misalign your Slimduct™ run and create stress on the joints.
- Use the correct screws. Stainless or coated screws resist rust and hold better over time.
- Add an end fitting for vertical runs. It prevents the cover from slipping downward due to gravity or vibration.
- Match the inlet size to your Slimduct™. Always check compatibility to maintain a tight and seamless connection.
Why Choose Inaba Denko Slimduct™ Wall Inlets?
Inaba Denko America is known for durable, professional-grade accessories designed for long-lasting HVAC and refrigeration performance. The SW and SWA wall inlets are made from high-quality PVC engineered to resist UV damage, cracking, and discoloration. They are available in multiple sizes and colors to match your Slimduct™ system and your project’s aesthetic.
The Bottom Line
Choosing the right wall inlet, SW or SWA, comes down to your installation setup and the level of sealing required.
- Use SW for wall sleeves, vertical applications, and long-term sealing performance.
- Use SWA for quick, simple installations where flexibility and speed matter most.
Both options provide the same professional look and protection, keeping your system safe from the elements and maintaining that polished, finished appearance your clients will appreciate.
FAQs
What is the purpose of a Slimduct™ wall inlet?
A Slimduct™ wall inlet connects and protects refrigerant or drain lines as they pass through a wall. It seals the entry point, prevents water and pest intrusion, and creates a professional appearance.
Can I use a wall inlet cover without caulking?
It’s not recommended. Even though the cover fits tightly, caulking adds an extra layer of protection against leaks, insects, and drafts.
What’s the difference between the SW and SWA wall inlets?
The SW has a two-piece design (base + cover) for use with wall sleeves, while the SWA is a one-piece version ideal for faster installs without sleeves.
Are Slimduct™ wall inlets compatible with all HVAC systems?
Both SW and SWA wall inlets can be used with most ductless, mini-split, and VRF systems that require refrigerant or electrical line protection.
TLDR Summary:
The Slimduct™ wall inlet is a small but critical HVAC component that protects and seals refrigerant and drain lines as they pass through walls. Inaba Denko America offers two top choices: the SW (two-piece) and SWA (one-piece). The SW wall inlet provides an airtight seal for wall sleeves and is best for vertical applications. The SWA wall inlet is faster to install, great for direct wall penetrations, and offers flexibility in alignment. Both deliver a clean, professional finish and long-lasting protection. Choose SW for precision and sealing, SWA for speed and simplicity.
