De Marinis ISO 25 PLUS P2T9-RM 90° single-wall inlet tee G50

The De Marinis P2T9-RM 90° tee is an ISO 25 PLUS G50 component designed to connect a single-wall appliance flue pipe directly to an insulated twin-wall chimney.

The main body uses the insulated ISO 25 PLUS construction, while the 90° lateral branch is manufactured as a single-wall connection.

The lateral inlet can be selected in two configurations:

• Male
• Female

This allows the appropriate joint orientation to be selected directly from the product page without requiring separate male and female product listings.

Main features

• Manufacturer: De Marinis
• Range: ISO 25 PLUS G50
• Product family: P2T9-RM
• Type: 90° tee with single-wall lateral inlet
• Branch angle: 90°
• Lateral branch: single wall
• Selectable connection: male or female
• Lateral branch diameter: variable Ønr
• Main body: insulated twin wall
• Inner wall: AISI 316L BA stainless steel – EN 1.4404
• Outer wall: AISI 304 BA stainless steel – EN 1.4301
• Insulation: 25 mm blown mineral wool
• Main available diameters: Ø100 to Ø350 mm

What the P2T9-RM is used for

The P2T9-RM is used where the appliance connecting flue is single wall and the main vertical chimney is an insulated ISO 25 PLUS twin-wall system.

The transition between the two systems is integrated directly into the 90° branch fitting.

Male or female inlet selector

The product page allows the lateral single-wall connection to be selected according to the joint orientation required by the connecting flue.

• Male: male single-wall connection;
• Female: female single-wall connection.

Ordering note: the inlet type does not define the diameter. Main flue diameter and lateral branch diameter must be selected separately where applicable.

Variable Ønr lateral branch

The nominal diameter of the single-wall lateral branch is identified by De Marinis as Ønr.

Ønr can differ from the main internal chimney diameter Øi and should be selected according to the single-wall flue pipe being connected.

Difference from the standard P2T9

The standard P2T9 uses a twin-wall lateral branch.

The P2T9-RM instead features a single-wall lateral connection, specifically designed for direct connection between a single-wall appliance flue and the insulated chimney.

ISO 25 PLUS and G50 classification

The P2T9-RM belongs to the De Marinis ISO 25 PLUS insulated twin-wall system.

The high-temperature system designation is:

T600-N1-W-V2-L50040/050/060-G50

The G50 classification corresponds to a 50 mm clearance from combustible materials in the certified ISO 25 PLUS configuration.

Important: G50 applies to the certified insulated ISO 25 PLUS system. The connected single-wall branch and appliance flue may require different combustible clearances.

Product configuration

When configuring the P2T9-RM, select:

• Main internal diameter Øi;
• Single-wall branch diameter Ønr, where available as an option;
• Inlet: Male or Female.

How to read the technical drawing

• Øi: nominal internal diameter of the insulated chimney;
• Øe: external diameter of the ISO 25 PLUS system;
• Ønr: nominal diameter of the single-wall lateral branch;
• Hu: overall fitting height;
• A / B: overall fitting dimensions;
• I: joint depth;
• Male / Female: selected single-wall inlet configuration.

Installation

The fitting must be installed according to the correct joint orientation of both the insulated chimney and the connected single-wall flue pipe.

The lateral branch and connecting flue must be independently supported to avoid transferring excessive structural loads to the tee.

Combustible clearances must be checked separately for the ISO 25 PLUS twin-wall section and the connected single-wall flue.

Installation must be carried out by qualified personnel in accordance with De Marinis technical documentation, appliance instructions and applicable regulations.