Seed Germination Chamber - GR-36L

This Percival® Scientific Seed Germination Chamber model GR-36L gives you a wide space to work with and is specially designed to optimize seed germination and plant development. The GR-36L provides a high level of flexibility and accommodates research and experiments in multiple fields. Vertically mounted fluorescent lights, three on each side, are programmable through the Percival IntellusUltra controller, giving you detailed and accurate control over your project. The IntellusUltra controller allows you to constrain the interior conditions of the environment, including lighting, airflow, temperature and other parameters. Take a look at the product specifications for more information and see the optional additions to order a germination chamber that fits your needs exactly.

Download a PDF of this product – GR-36L



Percival’s IntellusUltra Controller

  • Percival Scientific has built a reputation of providing flexible, customized options for research scientists around the world. We have taken the philosophy to the next level with our improved IntellusUltra Controller. Now choose from the levels of functionality that meet your needs.

Lighting System

  • Fluorescent lamps vertically mounted (three per side) on each side of shelf
  • Intensity programmable up to 140 micromoles/m2/sec of light irradiance measured at 6” from lamps on 2 on/off light events
  • Programming and control of the lighting is done via IntellusUltra real time controller


  • Operating conditions within the growth area to be maintained by conditioned air horizontal through the chamber and back to air conditioning unit on ceiling which contains a refrigeration coil, expansion device, condensate pan and recirculation fans

Cabinet Construction

  • Interior constructed of 22-gauge electro-zinc plated steel
  • Exterior constructed of 18-gauge exterior electro-zinc plated steel
  • Welded seams and joints on outer and inner shells
  • Inner shell supported by non-compressing/non-thermal conducting material locking inner liner in place without a metal-to-metal bond to outer case
  • Chamber is completely self-contained
  • Overall wall thickness is 2”
  • Two 1 1/4” diameter access ports on R.H. wall
  • Chamber floor equipped with floor drain and hose assembly
  • Contains caster assembly and adjustable leveling legs to compensate for floor unevenness in the lab


  • Woodless construction using CFC free insulation (overall wall thickness is 2”, ample insulation for maintenance of stated temperature range)


  • One door opening of 29.2” x 57.5” providing full access to chamber interior (magnetic gasket provides a tight seal to door frame)

Interior Space

  • 29.7 cu.ft. with work area of 76.5 sq.ft. provided on fifteen shelves


  • Fifteen tiers of white epoxy coated steel wire shelving (each shelf is 27”D x 25.1”W)
  • Shelves side in and out easily on stainless steel rail assemblies
  • Clearance between shelves is 2.6”


  • Interior and exterior painted with high reflective, environmentally friendly, high temperature baked white powder coating


  • Self-contained air-cooled condensing unit with hot gas bypass system for continuous compressor operation, extended life and close temperature control (this continuous running condensing unit ensures precise temperature control by alternating cycling refrigerant and hot gas to coil; this also prolongs life of compressor, and eliminates risk of ice buildup in coil)
  • Top mounted refrigeration system allows easy access for maintenance (e.g. cleaning)
  • As heat is rejected, it rises and is dissipated into room without having any effect on inside temperature of cabinet
  • Solenoid valves have extended stem for quiet and long life operation
  • Ceiling mounted evaporator coils incorporate twin air circulation fans in aluminum housing (heat rejection to ambient with standard chamber: 3500 BTU/hr)

Temperature Range

  • 5-44C (+/- 0.5C) with lights on and 2-44C (+/- 0.5C) with lights off

Temperature Safety Limit Controls

  • Experiment Protection: Adjustable high and low temperature controls, audible alarms, and visual indicators provided
  • Controls shut down all power to chamber, activating alarms (when the temperature returns to the normal range the system will automatically reset)

Convenience Receptacles

  • Two 115/1/60 convenience receptacles provided inside chamber

Electrical Requirements

  • Consult Geneva Scientific for electrical requirements and amperage draw.


  • Additive Humidity Control with Sensor
  • Dehumidifier with Sensor
  • IntellusUltra Connect
  • Android-Based Touch Screen
  • CO2 Enrichment Package
  • Self-Contained Water-Cooled Condensing Unit
  • Dry Alarm Contacts
  • Dimmable Lighting
  • LED Lighting in Lieu of Fluorescent Lamps
  • Please contact us for more optional items***Specifications subject to change.***
ModelTemp Range with lights onInterior Space (Volume)Total Shelving Floor AreaMaximum Growing HeightExterior DimensionsLight Intensity 6" from lamps# of Tier
GR-36L5-44±0.5 °C29.7 ft3
0.8 m3
76.5 ft2
7.1 m2
2.6 in
6.7 cm
33.5 in (W)
36.6 in (D)
77.2 in (H)
140 µmoles/m2 /s15