The AC Infinity Humidity Dome is a heavy-duty three-piece propagation kit that holds a stable pocket of humid air over germinating seeds and unrooted cuttings, the stage when young plants have no roots to replace the moisture their leaves lose. It comes in two sizes, a 40-cell Standard and a 72-cell XL, and unlike most single-height domes its height extension kit ships in the box rather than as a separate purchase, so the same dome can carry clones and taller cuttings well past the first true leaves. The dome supplies the sealed canopy that pairs naturally with gentle bottom warmth from the AC Infinity Suncore H3 Heat Mat, which speeds germination and helps the dome reach working humidity faster.
The stack builds from a sealed base tray that catches every drop of drainage, protecting benches and windowsills while stiffening the assembly under heavier loads. A cellular seedling tray nests inside it and drains excess water downward, with heavier gauge walls than typical nursery trays: 1.5 mm on the Standard and 2.5 mm (0.1 in) on the XL. Over the top sits a 3 mm thick gloss dome fitted with adjustable vents, two on the Standard and four on the XL, which meter fresh air into the canopy without dumping its humidity. The included extension assembles between tray and dome from two vented panels, two side panels and eight bolt and wing nut sets, lifting the ceiling from 16.7 cm (6.57 in) to 27.2 cm (10.70 in) on the Standard and from 23.7 cm (9.33 in) to 34.6 cm (13.62 in) on the XL while adding two further adjustable vents to each size.
The Standard tray covers 36.1 x 23.1 cm (14.24 x 9.09 in) and suits a windowsill or shelf where bench space is tight, while the XL covers 54.5 x 28.4 cm (21.45 x 11.18 in) and matches the standard 1020 tray format, sitting neatly over a 1020-sized heat mat. As seedlings emerge, opening the vents progressively hardens growth off before the dome comes away entirely, and cuttings strike more reliably when stems are dipped in a rooting gel such as GT Clonex before setting into the cells. The included extension panels bolt on in minutes and raise the ceiling by more than 10 cm on either size, letting one kit take a tray of cuttings from strike through to transplant without a second purchase.
NOTE: only the XL tray matches the standard 1020 footprint; the Standard tray is smaller than a 1020 heat mat such as the Suncore H3 and leaves part of the mat surface uncovered.
Holds Humidity
Gloss dome seals moisture around seeds and cuttings until new roots can support them.
Extension Included
Vented height extension ships in the box, adding over 10 cm of headroom for clones and taller cuttings.
Sealed Drip Base
Seedling tray drains into a sealed base tray that protects benches and supports heavier loads.
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Height extension kit included in the box, not sold separately, adding two vented panels and over 10 cm of ceiling
40-cell Standard tray covers 36.1 x 23.1 cm (14.24 x 9.09 in); 72-cell XL covers 54.5 x 28.4 cm (21.45 x 11.18 in)
Ceiling heights: 16.7 to 27.2 cm (6.57 to 10.70 in) on the Standard, 23.7 to 34.6 cm (9.33 to 13.62 in) on the XL
Adjustable vents meter hardening-off airflow: 4 total on the Standard and up to 6 on the XL with the extension fitted
3 mm thick gloss dome over reinforced trays of 1.5 mm (Standard) and 2.5 mm (XL) gauge
XL tray matches the standard 1020 format and sits neatly over the AC Infinity Suncore H3 Heat Mat
Kit contents: dome, base tray, seedling tray, 2 vented panels, 2 side panels, 8 bolt and wing nut sets
2 year manufacturer warranty
Directions for Use
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Set the seedling tray into the base tray so excess water drains into the sealed reservoir below.
Sow 2 to 3 seeds per cell and cover lightly with growing media.
Water the starter mix until it darkens, then tip away any excess.
Fit the dome with all vents closed to build humidity; a seedling heat mat beneath the tray speeds this up.
When the first seeds germinate, open one vent; once about half the tray has sprouted, open two.
For taller cuttings or clones, bolt the extension between tray and dome with the vented panels on opposite ends, securing the corners with the bolt and wing nuts.
Remove the dome once roughly half the cells have germinated to begin hardening off.
To clean, separate the sections, wipe with a solvent-dampened cloth and dry upside-down before storage.
Technical Specifications
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Standard (AC-HDA5)
Product Model: AC-HDA5
UPC Code: 819137023208
Cell Count: 40
Tray Footprint: 36.1 x 23.1 cm (14.24 x 9.09 in)
Height (Standard): 16.7 cm (6.57 in)
Height (Extended): 27.2 cm (10.70 in)
Tray Thickness: 1.5 mm
Vents: 2 built-in rotating vents; 4 total with extension fitted
XL (AC-HDA7)
Product Model: AC-HDA7
UPC Code: 819137023864
Cell Count: 72
Tray Footprint: 54.5 x 28.4 cm (21.45 x 11.18 in)
Height (Standard): 23.7 cm (9.33 in)
Height (Extended): 34.6 cm (13.62 in)
Tray Thickness: 2.5 mm (0.1 in)
Vents: 4; 6 with extension fitted
All Models
Dome: 3 mm thick, gloss finish
Tray Colour: Black
Included: Humidity dome x1, base tray x1, seedling tray x1, vented panel x2, side panel x2, bolt and wing nut set x8
We have a 30-day return policy, which means you have 30 days after receiving your item to request a return.
To be eligible for a return, your item must be in the same condition that you received it, unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase.
If your return is accepted, we’ll send you a return shipping label, as well as instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted.
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