Ventilation and air-conditioning
RU EN

Energy industry


Modern energy-efficient solutions require modern materials. RU-FLEX synthetic rubber-based foam insulation meets the high requirements of the energy industry. The insulation is durable and reliable, exceeding the service life of alternative materials, and has proven itself in the best possible way.

Modern ventilation and air-conditioning circuits require thermal insulation to increase system efficiency. Owing to its easy installation, low weight and attractive appearance, RU-FLEX foam rubber materials with and without coatings are the current solution for this task.

To help choose the right RU-FLEX VENT-SK and RU-FLEX ST thermal insulation thickness, we have prepared ready-made solutions (basic calculations).

Problem and solution

Calculation of insulation thickness for the supply ventilation system.

Initial data

  • Heat transfer medium: air
  • tо = 20 ˚С – temperature in the shopping center;
  • tm = -25 ˚С – temperature of the heat transfer medium in the duct, winter time;
  • ϑв = 4 м/с – velocity of the heat transfer medium;
  • ϕ = 60 % — relative humidity in the shopping center.
Without cover layer:
Duct dimensions, mm Calculated insulation thickness RU-FLEX VENT-SK, mm Recommended insulation thickness RU-FLEX VENT-SK, mm
150х150 15,71 Р19
200х200 15,98
450х450 16,47
900х600 16,65
With foil-covered coating (METAL):
Duct dimensions, mm Calculated insulation thickness RU-FLEX VENT-SK METAL, mm Recommended insulation thickness RU-FLEX VENT-SK METAL, mm
150х150 22,87 Р 25
200х200 23,38
450х450 24,4 Р 25
900х600 24,78

P-Designation of the roll-fed material.
Calculations made according to SP 61.13.330.2012 RF

* If a ready-made thermal insulation solution is a construction consisting of two or more layers, it is recommended to use thermal insulation material ST with ALU coating.

Calculation of insulation thickness for the exhaust ventilation system

Initial data

  • Heat transfer medium: air
  • tm = +20 ˚С – temperature of the heat transfer medium in the duct;
  • tокр = -25 ˚С – ambient temperature (coldest five-day period (0.92) in Moscow);
  • ϑв = 4 м/с – coolant velocity;
  • φ = 80 % — relative humidity of the ambient air.

According to the technical specifications (TS), RU-FLEX outdoor installation is possible if coatings are used to protect the surface of the products from weathering.

With foil-coated cover layer (PROM ALU):
Duct dimensions, mm Calculated insulation thickness RU-FLEX ST PROM ALU, mm Recommended insulation thickness RU-FLEX ST PROM ALU, mm
150х150 16,6 Р19
180х180 16,79 Р19
200х200 16,87 Р19
450х450 17,37 Р19
900х600 17,6 Р19

Ventilation of apartment buildings according to SP (Construction Regulations) 60.13330.2012 is permitted with combustible materials of flammability group not lower than G1. In most cases, general ventilation systems in residential buildings are used.

The main purpose of foam rubber insulation in apartment buildings is to reduce mechanical and aerodynamic noise and to prevent condensation. For these purposes RU-FLEX VENT can be used, which is a good soundproofing material and at the same time prevents condensation. To meet the requirements for thermal insulation, RU-FLEX VENT has a flammability group G1.

Calculations made according to SP 61.13.330.2012 RF