What Size Inline Fan for 4x4 Grow Tent?

What Size Inline Fan for a 4x4 Grow Tent? 

Choosing the right inline fan for your Gorilla Grow Tent 4x4 (4’x4’x6’11”) is crucial for maintaining proper airflow, temperature, and humidity. The correct fan size depends on the CFM (Cubic Feet per Minute) requirement. In this guide, we’ll show you how to calculate the required fan size and recommend the best inline fans for your 4x4 grow tent.

How to Calculate the Ideal Inline Fan Size (CFM)

Step 1: Calculate Tent Volume

The volume of your Gorilla Grow Tent 4x4 is:

4' x 4' x 6.92' = 110.72 cubic feet

Step 2: Determine Required CFM

A grow tent needs at least one full air exchange per minute, so the minimum required CFM is 110.72 CFM. However, we need to adjust for:

• Carbon Filter (25% CFM reduction)
• Ducting & Bends (5-10% loss per bend)
• High-Heat Equipment (25-30% extra CFM needed for HID lights)

With these factors, the final CFM requirement is:

110.72 x 1.5 = 166 CFM (Moderate Setup)

110.72 x 2.0 = 220 CFM (High-Heat Setup with Carbon Filter)

Best Inline Fan Size for a 4x4 Grow Tent

1. 4-Inch Inline Fan (150-200 CFM)

✔ Suitable for low-heat LED setups.

2. 6-Inch Inline Fan (250-350 CFM) – Best Choice

✔ Recommended for most 4x4 setups, especially with a carbon filter.

3. 8-Inch Inline Fan (500+ CFM) – For High Heat Setups

✔ Needed for HPS lights, long ducting, or extra cooling.

Do You Need an Intake Fan?

Passive Intake: Most 4x4 tents use open vents for fresh air intake.

Active Intake: If using HID lights or a sealed tent, consider a 4-inch intake fan (100-150 CFM).

Final Recommendation

For a Gorilla Grow Tent 4x4 (4'x4'x6'11"), the best inline fan size is:

• ✅ 6-inch inline fan (250-350 CFM) – Best for most growers
• ✅ 8-inch inline fan (500+ CFM) – If using CO2 or HID lights

With the right fan, you’ll improve airflow, prevent heat buildup, and create the ideal environment for your plants! 🌱💨