De Marinis ISO 25 PLUS P2TC 90° cross tee with inspection G50

The De Marinis P2TC 90° cross tee with inspection is an ISO 25 PLUS G50 component designed to provide both a 90° lateral connection and a dedicated access point for flue inspection and maintenance.

The cross configuration consists of the main vertical flue and two opposite lateral openings: one for the flue connection and one fitted with an inspection closure.

The P2TC is manufactured with an AISI 316L BA stainless-steel inner wall, an AISI 304 BA stainless-steel outer wall and 25 mm blown mineral wool insulation.

It is available in nominal internal diameters Ø80, 100, 130, 150, 180, 200 and 250 mm.

Main features

• Manufacturer: De Marinis
• Range: ISO 25 PLUS G50
• Product family: P2TC
• Type: 90° cross tee with inspection
• Branch angle: 90°
• Function: lateral connection and inspection access
• Configuration: cross tee with opposite inspection opening
• 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
• Joint depth I: 45 mm
• Installation: indoor or outdoor
• Available diameters: Ø80 to Ø250 mm

What the P2TC is used for

The P2TC is used where a 90° lateral flue connection is required while maintaining direct access to the internal flue passage.

The opposite inspection opening allows maintenance operations to be carried out without removing the connected branch.

Typical inspection activities include:

• visual checks;
• flue cleaning;
• removal of deposits;
• routine maintenance.

Difference between P2TC and P2T9

The standard P2T9 is a conventional 90° tee.

The P2TC adds an opposite inspection opening, creating a cross-shaped fitting that provides direct access to the internal passage.

Inspection opening ØT

De Marinis identifies the inspection opening diameter as ØT.

From Ø80 to Ø200, ØT matches the nominal main flue diameter. For P2TC250, the inspection opening is ØT = 200 mm.

Important: the inspection opening must remain accessible after installation to allow cleaning, checking and maintenance of the flue system.

ISO 25 PLUS and G50 classification

The P2TC belongs to the De Marinis ISO 25 PLUS insulated twin-wall flue system.

The high-temperature 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 manufacturer configuration.

Important: G50 applies only to the certified ISO 25 PLUS configuration installed according to De Marinis instructions.

ISO 25 PLUS construction

• Inner wall: AISI 316L BA stainless steel;
• Outer wall: AISI 304 BA stainless steel;
• Insulation: 25 mm blown mineral wool;
• System: insulated twin wall;
• Installation: indoor or outdoor.

CE marking and system designations

The ISO 25 PLUS system is CE marked according to EN 1856-1:2009.

P2TC dimensions and De Marinis product codes

Dimensional note: joint depth I is 45 mm for all versions. Hu, A, B and ØT vary according to nominal diameter. The official P2TC range is available up to Ø250 mm.

How to read the technical drawing

• Øi: nominal internal flue diameter;
• Øe: external twin-wall diameter;
• Hu: overall usable fitting height;
• A: vertical dimension to the lateral opening centre;
• B: lateral projection of the fitting;
• ØT: inspection opening diameter;
• I: joint depth, 45 mm.

Installation

The P2TC must be installed according to the correct flue orientation while keeping the inspection opening fully accessible.

Connected sections must be properly supported to prevent excessive mechanical loads from being transferred to the fitting.

The inspection point must remain accessible for periodic checking, cleaning and maintenance.

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