• Preventing duct condensation at 95% relative humidity
• Minimizing direct drafts that cause substrate drying and mushroom browning
• Reducing temperature and humidity differences between cultivation tiers

Substrate drying from direct unit-cooler airflow

Strong cold air accelerated substrate evaporation and drying, creating uneven growth and quality. Air distribution needed to reduce direct drafts and stabilize moisture.

Mushroom browning from direct airflow

Direct drafts caused drying stress at the mushroom surface. Concentrated airflow on particular tiers increased browning, uneven growth and loss of marketability.

Growing at 95% relative humidity

Mushrooms require high humidity, but 95% RH readily causes condensation on conventional metal ducts or cold outlets, creating drip, mold and contamination risks.

Permeable fabric to suppress condensation

Small amounts of air passed through the fabric surface, forming an air layer that reduced condensation and enabled stable supply without droplets at 95% RH.

Indirect airflow without direct drafts

Gentle, room-wide diffusion reduced rapid substrate evaporation rather than blowing directly onto mushrooms, stabilizing substrate moisture across tiers.

Uniform airflow throughout cultivation

Duct positions and discharge directions matched the vertical racks. Distributed supply reduced airflow concentration and temperature and humidity differences between tiers.

Reduced substrate drying

Gentle distribution of the unit-cooler air reduced rapid surface evaporation, stabilizing substrate moisture and reducing growth variability.

Lower browning risk through fewer direct drafts

Room-wide diffusion reduced direct airflow at the mushroom surface, limiting drying and browning risks and easing growth stress.

No condensation at 95% RH

No droplets formed on the duct surface in the humid environment, reducing drip, contamination and mold risks and confirming suitability for mushroom cultivation.