This was an experiment with black bean tempeh. The loaf on the left was made in a Sterilite 3 Cup plastic container with 3/32th vent holes drilled in bottom, sides, and lid. The loaf on right was created in an aluminum bread pan measuring 6.37 Inches by 3.75 Inches by 2.75 Inches. The aluminum foil lid had holes punched with a bamboo skewer every inch.
Instant Pot Ultra 6 quart using Yogurt setting on low was used as incubator. A cup of water was added to the pot with trivet. The bread pan was setting on the trivet with Sterilite container stacked crosswise on top.
The temps in the top container topped out at 104 F while the bottom container topped out at 100 F. The bottom container appears to have better mycellium growth on top but needed a butter knife to be run around the sides of the pan in order to get the loaf to release. The plastic container only required a tap on the container bottom for the loaf to come out
The pictures are after