When to Introduce Fresh Air (FAE)
When to Introduce Fresh Air (FAE)
Fresh air exchange (FAE) is what triggers your grow to start fruiting. Timing it correctly makes a big difference in how your mushrooms develop.
When to Start
Introduce fresh air once your substrate is:
- Fully colonized
- White across the surface
- Starting to show early pinning (small mushroom formations)
Do not introduce fresh air too early.
How to Do It
For CVG (dung-loving species):
Cut a slit just above the substrate about the width of the filter patch.
For Masters Mix (wood-loving species):
Cut a slit directly into the side of the substrate where you want mushrooms to grow.
What to Expect
- Pins will begin forming near areas with fresh air
- Growth will accelerate once conditions are right
- Mushrooms will form where humidity and airflow are balanced
Important Notes
- Fresh air and humidity must stay balanced
- Too much airflow can dry out your grow
- Too little airflow can stall development
- Keep conditions stable after introducing FAE
Common Mistakes
- Introducing fresh air too early
- Cutting openings that are too large
- Letting the substrate dry out
- Not providing enough airflow
- Constantly changing conditions