When it comes to mushroom cultivation, maintaining a sterile environment is crucial. Contaminants like bacteria and mold can quickly derail your grow efforts. Enter the Still Air Box (SAB) — an affordable, easy-to-build tool that creates a contamination-resistant workspace. In this guide, we’ll show you exactly how to make a professional-quality SAB that’s both functional and simple to use.
What Is a Still Air Box?
A Still Air Box is an enclosed workspace designed to limit airflow and reduce the risk of contaminants landing on your sterile materials. Unlike expensive laminar flow hoods, SABs rely on still air rather than filtered airflow. This simplicity makes them a must-have for any cultivator, whether you’re just starting out or you’re an experienced mycologist.
Why Use a Still Air Box?
- Cost-Effective: Building a SAB requires only a few inexpensive materials.
- Easy to Assemble: No special tools or skills are needed.
- Highly Effective: It creates an environment with minimal air currents, drastically reducing contamination risks during sensitive processes like inoculation or spore transfers.
Materials You’ll Need
Here’s what you’ll need to build your own Still Air Box:
1. Clear Plastic Storage Bin: Choose a bin with a tight-fitting lid. A 50- to 70-liter bin works well.
2. Box Cutter or Hole Saw: For cutting armholes into the bin.
3. Sandpaper: To smooth out the edges of the armholes.
4. Rubber Gloves: For handling materials and ensuring sterility.
5. Ruler and Marker: To measure and mark the placement of the armholes.
6. Isopropyl Alcohol (70% or higher): For cleaning and sterilizing your SAB.
7. Optional Accessories: Duct tape to reinforce edges, and adhesive weatherstripping for a tighter lid seal.
Step-by-Step Instructions
1. Choose the Right Bin
- Select a clear plastic storage bin with a sturdy lid. Clear sides allow you to see what you’re working on without lifting the lid.
- Ensure the bin is large enough to comfortably fit your hands, tools, and materials.
2. Mark the Armholes
- Turn the bin upside down (lid on the bottom) so the open end faces you.
- Measure and mark two armholes on one of the longer sides of the bin. Place them about shoulder-width apart (approximately 25-30 cm).
- Use a marker to draw circles big enough for your forearms to fit through comfortably (10-12 cm in diameter).
3. Cut the Armholes
- Use a box cutter or hole saw to carefully cut along the marked lines.
- Take your time to ensure clean cuts and avoid cracking the plastic.
- Smooth the edges with sandpaper to prevent scratches or tears in your gloves.
4. Clean and Sterilize the Bin
- Wipe down the entire bin, inside and out, with isopropyl alcohol to remove dust, dirt, and potential contaminants.
- Focus on the armhole edges to ensure they’re completely clean.
5. Test the Fit
- Insert your gloved hands into the armholes to ensure they’re comfortable and allow for a full range of motion.
- Make any necessary adjustments to the hole size if needed.
Tips for Using Your Still Air Box
Work in a Clean Environment: Set up your SAB in a room with minimal airflow (close windows and turn off fans).
Sterilize Everything: Before starting, spray the inside of your SAB and all tools with isopropyl alcohol.
Minimize Movement: Move slowly to avoid creating air currents that can stir up contaminants.
Seal the Lid: If your lid isn’t tight-fitting, use duct tape or weatherstripping to create a better seal.
Common Mistakes to Avoid
Cutting Holes Too Big: Oversized armholes allow contaminants to enter more easily.
Skipping Sterilization: Always clean your SAB and tools thoroughly before use.
Poor Bin Placement: Don’t place your SAB near vents, fans, or open windows.
Why a Still Air Box is Better for Beginners
Unlike laminar flow hoods, which can cost hundreds of dollars and require precise construction, a Still Air Box is accessible and forgiving. Its simplicity and effectiveness make it an essential tool for hobbyists and beginners who want to practice sterile techniques without breaking the bank.
Final Thoughts
Building your own Still Air Box is a simple and rewarding project that can significantly improve your success rate in mushroom cultivation. By reducing contaminants and providing a clean workspace, a SAB ensures you’re set up for success, whether you’re transferring spores, inoculating jars, or performing other sterile tasks.
Ready to get started? Grab your materials and build your SAB today — your mushrooms will thank you!