does this work with a heating mat or is too thick?

I use this with a Vivosun heating pad and it works perfectly fine. The temps on the inside of the box register about 3-5 degrees higher with an 82% humidity. Without the 45W LED grow light I have, it's only about 2-3 degrees higher.

Please make the dimensions clear. I see three numbers? Which is width, and height, and length? Or what do all the numbers correspond to?

The fact they d not make this clear is sloppy and to question competence is not “nasty.”

how many 2" seedling pots will fit in it?

Let's look at this as an algebra problem... The space is 15×9 in 15 inches *the most* 2" pots you could potentially fit is 7 and in 9 inches*the most* 2" pots you could potentially fit is 4 ... So in a 15×9 tray *the most* 2" pots you could potentially fit is 28

Do the red seedling trays come with this? They are shown in the photos

No- just the bottom tray and the domed lid.

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EarlyGrow Medium Seed and Herb Domed Propagator with Vented Side Height Extension and Security Clip Set, Polypropylene Plastic, Green, Extender

Product ID: 392844987

Details

Colour
Green
Material
Polypropylene
Planter form
Tray
Special features
Heavy Duty
Style
Compact

🌿4-panel vented height extension

💧humidity control with adjustable vents

🔒secure clip system for stability

Description

🌱 Elevate your green thumb game with the ultimate grow dome!

SECURE STABLE SETUP - Includes 4 easy-attach clips to keep dome and tray firmly connected
DURABLE LONG LASTING - Heavy-duty polypropylene tray resists buckling and moisture damage
VERSATILE 3 SEASON USE - Ideal for indoor windowsills or outdoor early-season seed protection
PERFECT HUMIDITY CONTROL - Adjustable side vents lock in moisture without daily fuss
GROW TALLER STRONGER PLANTS - Vented height extension supports growth up to 10.5"

The EarlyGrow Medium Seed and Herb Domed Propagator features a durable polypropylene tray and a clear dome with a four-panel vented height extension, allowing plants to grow up to 10.5 inches tall. Adjustable side vents maintain optimal humidity, while included security clips ensure a stable, secure setup. Designed for three-season use, it protects seedlings indoors or outdoors, making it perfect for professional gardeners and kitchen herb enthusiasts alike.

Specifications

ASIN	B08KC9N69T
Brand Name	EarlyGrow
Color	Green
Customer Reviews	4.5 4.5 out of 5 stars (330)
Finish Types	Unfinished
Included Components	Security Clips
Indoor Outdoor Usage	Indoor, Outdoor
Item Dimensions	15 x 9 x 7 centimeters
Item Dimensions D x W x H	22.9D x 38.1W x 17.8H centimeters
Item Type Name	Medium Seed and Herb Domed Propagator with Vented Side Height Extension and Security Clip Set
Manufacturer	EarlyGrow
Manufacturer Part Number	95468
Material Type	Polypropylene Plastic
Model Number	95468
Mounting Type	Inside Mount,Outside Mount
Number of Levels	1
Number of Pieces	4
Other Special Features of the Product	Heavy Duty
Pattern	Solid
Plant or Animal Product Type	Herbs
Planter Form	Tray
Product Style	Compact
Shape	Rectangular
Size	Medium with Side Extender and Clip Set
UPC	810178032723
Unit Count	1 Count

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